Our collection contains stored memories. There are pieces we have collected throughout our lives in addition to a herbarium, a large number of photographs, and a great diversity of building materials!

Collection

Leaf forms

Lobate foliage

Acer cappadocicum

cappadocian maple

Acer japonicum `Aconitifolium`

cutleaf fullmoon maple

Acer pensylvanicum

striped maple

Acer platanoides `Crimson King`

purple leaved norway maple

Acer platanoides

norway maple

Acer pseudoplatanus

sycamore

Catalpa ovata

yellow catalpa

Fagus sylvatica `Asplenifolia`

fern leaf beech

Liquidambar styraciflua

american sweetgum

Liriodendron tulipifera

tulip tree

Platanus x hispanica

london plane

Platanus orientalis

oriental plane

Populus alba

abele

Quercus rubra

northern red oak

Pinnate foliage

Ailanthus altissima

tree of heaven

Carya cordiformis

bitternut hickory

Fraxinus excelsior

european ash

Gleditsia triacanthos

honey locust

Gymnocladus dioicus

kentucky coffeetree

Koelreuteria paniculata

goldenrain tree

Pterocaria fraxinifolia

caucasian wingnut

Rhus glabra

smooth sumac

Robinia pseudoacacia

black locust

Styphnolobium japonicum

japanese pagoda tree

Beech like foliage

Alnus glutinosa

common alder

Betula pendula

silver birch

Carpinus betulus

common hornbeam

Castanea sativa

sweet chestnut

Fagus sylvatica

European beech

Populus nigra

black poplar

Populus tremula

aspen

Tilia cordata

small-leaved lime

Tilia tomentosa

silver linden

Ulmus minor

field elm

Herbarium

trees and shrubs

Acer opalus

Italian maple

Acer platanoides

Norway maple

Acer pseudoplatanus

sycamore

Aesculus hippocastanum

horse-chestnut

Alnus incana

grey alder

Alnus viridis

green alder

Betula pendula

silver birch

Calluna vulgaris

common heather

Carpinus betulus

common hornbeam

Castanea sativa

sweet chestnut

Cornus mas

cornelian cherry

Cornus sanguinea

common dogwood

Corylus avellana

common hazel

Crataegus laevigata

midland hawthorn

Euonymus europaeus

spindle

Fagus sylvatica

common beech

Fraxinus excelsior

common ash

Hippophae rhamnoides

common sea buckthorn

Ligustrum vulgare

wild privet

Lonicera xylosteum

fly honeysuckle

Parthenocissus inserta

thicket creeper

Quercus robur

pedunculate oak

Rhamnus catharticus

buckthorn

Robinia pseudoacacia

black locust

Salix gracilistyla

rose-gold pussy willow

Sambucus nigra

elder

Sambucus racemosa

red elderberry

Sorbus aria

whitebeam

Sorbus aucuparia

rowan

Syringa vulgaris

lilac

Viburnum lantana

wayfarer

Viburnum opulus

guelder-rose

meadow herbs

Aira caespitosa

tufted hairgrass

Ajuga reptans

bugle

Anthriscus sylvestris

cow parsley

Carex glauca

blue sedge

Chaerophyllum hirsutum

hairy chervil

Chrysanthemum leucanthemum

ox-eye daisy

Cuscuta trifolii

common dodder

Daucus carota

wild carrot

Euphrasia officinalis

drug eyebright

Heracleum sphondylium

hogweed

Juncus glaucus

blue rush

Knautia arvensis

field scabious

Orobanche minor

hellroot

Plantago media

hoary plantain

Pimpinella minor

salad burnet

Ranunculus acris

meadow buttercup

Rinanthus minor

yellow rattle

Rumex obtusifolius

bitter dock

Salvia pratensis

meadow clary

Symphitum officinale

common comfrey

perennials / grasses

Caltha palustris

marsh-marigold

Chrysanthemum alpinum

alpine moon daisy

Dactylorhiza majalis

western marsh orchid

Dryas octopetala

mountain avens

Epipactis helleborine

broad-leaved helleborine

Gentiana clusii

clusiu’s gentian

Gentiana verna

spring gentian

Globularia cardifolia

heart-leaved globe daisy

Globularia bisnagarica

Common Ball Flower

Hedysarum hedysaroides

alpine sainfoin

Hippocrepis comosa

horseshoe vetch

Homogyne alpina

alpine coltsfoot

Linaria alpina

alpine toadflax

Lotus corniculatus

common bird's-foot trefoil

Nigritella nigra

common black orchid

Poa alpina

alpine meadow-grass

Potentilla crantzii

alpine cinquefoil

Primula auricula

auricula

Primula integrifolia

entire-leaved primrose

Pulsatilla alpina

alpine pasqueflower

Ranunculus alpestris

alpine buttercup

Soldanella alpina

alpine snowbell

Thalictrum aquilegiifolium

sibarian columbine meadow-rue

Trifolium alpinum

siberian columbine meadow-rue

Viola biflora

alpine yellow-violet

Plants

Pictures of Plants

Primula x bullesiana

Hamburg (D), June-July 2009

Elymus magellanicus

Knautia macedonica
Lythrum salicaria ‘Lady Sackville‘

Schwerin (D), June-July 2009

Helenium ‘Waltraut‘

Knautia macedonica
Schwerin (D), June-July 2009

Primula beesiana

Hamburg (D), June-July 2009

Echinacea purpurea ‘Vintage Wine‘

Eryngium yuccifolium
New York (USA), August 2011

Lupinus polyphyllus

Furka (CH), August 2013

Artemisia ludoviciana ‘Silver Queen‘

Pennisetum alopecuroides ‘Hameln‘
Origanum Laevigatum-Hybride ‘Herrenhausen‘

Zurich (CH), September 2009

Bergenia cordifolia

Artemisia ludoviciana ‘Silver Queen‘
Aster sedifolius ‘Nanus‘

Zurich (CH), September 2009

Alchemilla mollis

Euphorbia characias ssp. wulfenii
Zurich (CH), September 2009

Lavandula angustifolia

Nepeta x faassenii
Santolina chamaecyparissus

Zurich (CH), September 2009

Lavandula angustifolia

Nepeta x faassenii
Salvia officinalis

Zurich (CH), September 2009

Gaura lindheimeri

Lavandula angustifolia
London (GB), October 2009

Mosses that inhabit shade

Conocephalum conicum

Scented Liverwort

Lunularia cruciata

Crescent-cup Liverwort

Marchantia polymorpha

Common Liverwort

Plagiomnium affine

Many-fruited Thyme-moss

Scleropodium purum

Neat Feather-moss

Mosses that inhabit halfshade

Dicranum scoparium

Gabelzahnmoos
Das Gabelzahnmoos ist in sauren Wäldern verbreitet. Es ist sehr formenreich. In der typischen Ausprägung sind die Blätter gekrümmt (sichelig) und zeigen alle in eine Richtung. Voraussetzung für die Gartenkultur ist ein halbschattiger Standort mit saurem Boden.

Hypnum cupressiforme

Schlafmoos
Hypnum ist ein Allerweltsmoos. Es kommt auf Felsen, Waldboden, Baumstämmen, morschem Holz und Mauern in einer unheimlichen Vielzahl von verschiedenen Varietäten vor, die sich sehr vom Aussehen unterscheiden. Sehr grosse, goldbraune Sippen wachsen auf Kalkfelsen, mittelgrosse an Baumstämmen und sauren Felsen (Schiefer, Granit). Schlafmoos eignet sich gut für den Bewuchs von Felsblöcken. Es bildet sehr schön dichte teppichartige Flächen aus.

Pleurozium schreberi

Rotstengelmoos
Man findet dieses Moos in sauren Wäldern und Heiden.

Polytrichum formosum

Hairy cap moss

Thuidium tamariscinum

Fern Moss

Mosses that inhabit sun

Ceratodon purpureus

Hornzahnmoos
Dieses Moos ist eines der häufigsten Arten. Es kommt auf Gestein, Borke, Dächern, in Regenrinnen oder in grossen Mengen auf Ödland in Sandgruben oder Industriebrachen vor. Die schmutzig grüne Art ist nicht so attraktiv, bildet aber im Frühjahr reichlich Sporenkapseln aus, die auf roten Stielchen (Seten) stehen und den Moosrasen rot verfärben.

Polytrichum juniperinum

Wachholder-Widertonmoos
Das Moos ist weltweit von den Ebenen bis ins Hochgebirge verbreitet. Es kommt auch in tropischen Gebirgen und in den Hochalpen vor. Es wächst an sonnigen und trockenen Plätzen auf kalkfreien Sand- und Silikatschuttböden außerhalb der Kalkgebiete. Oft ist es auf Bahngelände und ähnlichen exponierten Standorten zu finden.

Polytrichum piliferum

Glashaar-Widertonmoos
Polytrichum piliferum ist kosmopolitisch verbreitet (alle Kontinente einschließlich der Antarktis). In Mitteleuropa ist es vom Flachland bis ins Hochgebirge überall verbreitet und häufig.

Es wächst vor allem an konkurrenzfreien, oft extrem nährstoffarmen Standorten, wie auf Sand oder leicht übererdeten Felsen, gerne auch auf sauren Böden. Es verträgt starke Sonneneinstrahlung sowie Trockenheit. Typische Standorte sind beispielsweise in Heiden, auf Dünen, in Sandgruben oder auf Steinblöcken an Waldrändern, Weinbergen etc..

Racomitrium elongatum

Verlängertes Zackenmützenmoos
Diese Art (auf Silikatuntergrund) oder das ähnliche R. canescens (auf Kalk) kommt auf steinigem Boden an Wegrändern und in Sandgruben vor. Es hat - wie manch andere Trockenheitstolerante Arten - eine Blattrippe, die als weissliche Haarspitze austritt. Dadurch wirken die Pflanzen im trockenen Zustand weisslich.Angefeuchtet sind sie dann blass gelbgrün. Die Art eignet sich wegen ihrer Standortansprüche zur Bepflanzung von offenen, sonnigen Stellen oder Dächern.

Tortula ruralis

Dach-Drehzahnmoos
Diese Art eignet sich zur Bepflanzung von basischem Boden und Felsen. Das in allen Klimazonen außerhalb der Tropen recht häufige Moos wächst zumeist in ausgeprägter Polster- oder Kissenform, bildet aber auch Rasen. Es wächst sowohl im Flachland und dringt bis in die subalpine Stufe der Gebirge vor. Natürlich kommt es in erster Linie auf Felsen und Erde vor, besiedelt aber auch Mauern, Beton und Dächer. Selten ist es sogar auf totem Holz oder auf Borke zu finden.

Nature observation

Woods

Scotland GB

July 2002

Scotland GB

July 2002

Almese I

June 2006

Almese I

June 2006

Almese I

June 2006

Almese I

June 2006

Almese I

June 2006

near Lanark, Scotland GB

March 2006

near Lanark, Scotland GB

March 2006

near Lanark, Scotland GB

March 2006

near Lanark, Scotland GB

March 2006

Portland JA

February 2007

Portland JA

February 2007

Portland JA

February 2007

Portland JA

February 2007

Portland JA

February 2007

Portland JA

February 2007

Portland JA

February 2007

Portland JA

February 2007

Portland JA

February 2007

St. Andrew JA

February 2007

St. Andrew JA

February 2007

Üetliberg ZH

August 2008

Üetliberg ZH

August 2008

Üetliberg ZH

August 2008

Cornwall GB

June 2008

Cornwall GB

June 2008

Water

Zumikon ZH

waterfall

Zumikon ZH

waterfall

Geology

Gravel

E1 Andeer granite

Origin: Andeer, GR
Type of rock: Orthogneiss

Andeer granite is fine-grained and has a light, definitely green colour.

E2 Valser quartzite

Origin: Vals, GR
Type of rock: Glimmergneis/slate [glitter gneiss/slate]

The individual grain is elongated, and the rock is light bluish green in colour.  

E3 Soglio quartzite

Origin: Casaccia, GR
Type of rock: Hellglimmergneis [light glitter gneiss]

No gravel is produced that contains only Soglio quartzite.

E4 Calanca gneiss

Origin: Arvigo, Calancatal, GR
Type of rock: Zweiglimmergneis [two-glitter gneiss]

This gneiss has a high proportion of glitter and light stones.

E5 Iragna gneiss

Origin: Biasca, TI
Type of rock: Fine-grained gneiss

This rock is heterogeneous in appearance.

E6 Maggia gneiss

Origin: Carentino, TI
Type of rock: Zweiglimmergneis [two-glitter gneiss]

This gravel is dark gneiss that is somewhat shiny due to its high proportion of glitter, and it has a slate-like structure.

E7 Maggia gneiss

Origin: Riveo, TI
Type of rock: Gneiss

This gravel is dark gneiss that is somewhat shiny due to its high proportion of glitter, and it has a slate-like structure.

E8 Bergün porphyry

Origin: Bergün, GR
Type of rock: Quartz porphyry

Quarry: Farrirola Bergün

E9 St. Léonhard quartzite

Origin: St. Léonhard, VS
Type of rock: Carbonate quartzite

A light, slightly yellowish stone

A1 Bex Alpine limestone

Origin: Bex, VD
Type of rock: Sparry limestone, known as Spatkalk

Some of the grains are reddish or bluish in colour.

A2 Zweisimmen Alpine limestone

Origin: Zweisimmen, BE
Type of rock: Chalk/dolomite breccia

Quite light, brownish grey and homogenous Alpine limestone

A3 Mitholz siliceous limestone

Origin: Blausee-Mitholz, BE
Type of rock: Siliceous limestone

A4 Balmholz siliceous limestone

Origin: Sundlauenen, BE
Type of rock: Siliceous limestone

A5 Rotzloch siliceous limestone

Origin: Rotzloch, NW
Type of rock: Siliceous limestone

Dark, rather neutral grey with many white calcite veins

A6 Seewen siliceous limestone

Origin: Seewen, SZ
Type of rock: Siliceous limestone

The stone has a homogenous appearance due to its very fine-grained mineral structure and the very low proportion of calcite veins (< 2%). The dark grey colour gives it a neutral appearance.

 

A7 Starkenbach Alpine limestone

Origin: Alt St. Johann, SG
Type of rock: Schratten chalk

A rather light, subdued grey Alpine limestone

A8 Schollberg Alpine limestone

Origin: Trübbach, SG
Type of rock: Quintnerkalk

This gravel has a light, bluish grey colour and a high proportion of calcite. 

A9 Balzers Alpine limestone

Origin: Balzers, FL
Type of rock: Limestone

This bluish grey stone has many calcite veins, so that there is a lot of white in the gravel.

A10 Hohenems Alpine limestone

Origin: Hohenems Unterklien, Austria
Type of rock: Alpine
limestone
This gravel is rather bluish grey.

AJ1.1 Delémont Jura limestone, crushed

Origin: Delémont, JU
Type of rock: Jura limestone

Jura gravel with a rather subdued, greyish yellow colour

AJ2 Mellikon Jura limestone

Origin: Mellikon, AG
Type of rock: Jura
limestone
Dense, homogenous chalk limestone with a greyish yellow colour and conchoidal fracture

AJ3 Eigeltingen Jura limestone (“Lägern chalk”)

Origin: Eigeltingen, Germany
Type of rock: Jura
limestone
Dense, homogenous and strong yellow limestone

AM1 Massongex sandstone (“grès des carriers”)

Origin: Massongex, VS
Type of rock: Quartz sandstone

U1 Mels verrucano

Origin: Flums-Mels, SG
Type of rock: Verrucano conglomerate

Reddish brown to violet in colour; plate-like grain that gives the extracted verrucano a layered structure

U2 Collonges verrucano

Origin: Collonges, VS
Type of rock: Verrucano conglomerate

This gravel is mixed with other gravels in grey and green. The grain is less plate-like than the grain of Mels verrucano. 

U3 Poschiavo serpentinite

Origin: Poschiavo, GR
Type of rock: Serpentinite

Greasy, shiny, dark green grain with a rather plate-like form

U4.1 Peccia marble (“Cristallina”)

Origin: Peccia, TI
Type of rock: Marble

M1 Mixed Riviera gneisses

Origin: Bezirk Riviera, TI
Type of rock: Gneisses, mixed

M2 Mixed Soglio gneisses

Origin: Casaccia, GR
Type of rock: Gneisses, mixed

Boulders

Punteglias granite

Surselva Valley of the Anterior Rhine, CH

Ilanz Verrucano

Surselva Valley of the Anterior Rhine, CH

Bunte Nagelfluh (colorful limestone conglomerate pebble)

Appenzell, CH

Quintnerkalk (Jurassic limestone)

Gonzen (mountain), CH

Gault sandstone

Alvier (mountain), CH

Seewerkalk limestone with karren (lapies)

Alpstein (mountain), CH

Sandstone with fossils

Staad near Rorschach, CH

Bunter Mergelkalk (marly limestone)

Rhine Valley near Chur, CH

Verrucano

Pizol (mountain), CH

Coarse-grained sandstone

Rheintal St. Gallen, CH

Basalt

Adelebsen/ Weserbergland, D

missing...

Mossy Limestone

Lägern/ Aargau, CH

Soil

Algeria

unknown place of finding

Argentinia

unknown place of finding

Australia

Darwin outback Broome

Australia

in the east

Botswana

unknown place of finding

Brazil

Amazon

Brazil

Brasilia

Brazil

foz do iguacu

Brazil

Rio de Janeiro

China

Port of Macau

Costa Rica

unknown place of finding

Germany

Friesland, Spiekeroog

Germany

Hiddensee

Germany

Hiddensee

Germany

Potsdam

England

Tintagel, Cornwall

England

Holcome Rogus, Devon

England

near the white horse, Cherhill

England

Painswick

France

Atlantic

France

massif central

Greece

unknown place of finding

Greece

Peloponnese

India

Himalaya

India

West India

Indonesia

Bali, southern beach

Indonesia

Bali, Lake Bratan

Italy

volcanic-ash, Mount Etna

Italy

island of Elba, Marina di Campo

Italy

Sardinia, Costa Smeralda

Italy

Sardinia, Porto Prailis

Italy

Sicily, Forum Romana

Italy

Sicily, Riserva Lo Zingaro

Jamaica

unknown place of finding

Jamaica

unknown place of finding

Jamaica

unknown place of finding

Canada

Banaff Park

Kenya

Amboseli park

Kenya

Massai Mara

Kenya

Mombasa

Kenya

Tsavo Park

Unknown country

Sahara

Marocco

Atlas Mountains

Marocco

Erfoud

Marocco

Sahara

Marocco

Taroudant

Mexico

unknown place of finding

Mexico

Yucatan, Tulum

Namibia

Kalahari

Namibia

Wolwedan

Norway

polar circle

Portugal

Madeira

Portugal

Pinhao

Portugal

Sessimbra

Russia

Black Sea

Scotland

Edinburgh

Spain

Competa

Spain

Fuerteventura

Spain

Gran Canaria, Lanzarote

Spain

Lanzarote

Spain

Madrid

Spain

Malaga

Spain

Mallorca, Portocolom

Spain

in the south of Mallorca

Spain

Mallorca

Spain

Tarragona

Tunisia

unknown place of finding

Tunisia

Hammamet

Tunisia

salt desert

Tunisia

south Tunisia, desert

Tunisia

desert

Tunisia

desert

USA

Harlemville, New York

USA

Monte Zuma Castle, Arizona

USA

Monument Valley, Arizona

USA

Walden Pond, Massachusetts

USA

Walden Woods Lincoln, Massachusetts

USA

west

Cyprus

mould

Cyprus

sand beach

Fieldwork

Surface

Chaussierung (macadamization)

The natural appearance of macadamized areas, paths, drives, and roads is a main feature of this type of surfacing, which has an unsealed top layer. For the surfacing and its top layer, for which ground natural stone material (KFN Netstaler® 0-15 mm) is used, no hydraulic or bituminous binder is used. This type of permeable macadamized paths and areas has a run-off coefficient of 0.5.
Ganz Landscape Architects use this type of surfacing due to the changeable character of the surface through the spreading various materials.

To obtain the desired look of the surfacing when macadamizing, the earth-moist material (KFN Netstaler® 0-15 mm) is installed under different conditions. It should be installed when temperatures remain above freezing for at least 24 hours. In addition, during installation direct sunlight, dry winds, and generally high temperatures should be avoided, or prevented using special measures such as shading or slight moistening, in order to avoid too-fast drying. To insure quality, installation should be postponed if bad weather is predicted, as rain/snow can cause untimely wash-out of the macadamized areas. For areas utilized as drives for cars, fire trucks, or ambulances, the robust foundation must be more strongly compressed than for footpaths or bicycle paths. With higher compression, the root areas of existing and newly planted trees must also be taken into consideration.

Generally the cohesive clay surface layer is compacted immediately after installation using a light vibrating plat compactor or small roller. A homogenous appearance should be achieved that is uniform also at the edges. The Planiegenauigkeit [grading precision] should be +/- 10 mm. The installed surface is then spread with 0 - 4 mm finely crushed stone in order to close open pores and is then rolled lightly one more time (without adding water).
After successful installation the surfacing should be allowed to harden slowly for about a week before the final spreading of material. For this reason it should not be walked or driven on.

For design purposes, the choice of the final aggregate will depend on its texture and color. Crushed stone, round gravel, and sand are used, whereby the top layer should not be bigger than about 1 to 1.5 times the grain size of the chosen material.

Gneiss surfacing with polygonal paving stones

For the renovation of Tiefenbrunnen Bad and Park, a garden monument built in 1954, Ganz Landscape Architects got involved with the traditional stonemasonry craft of working the edges of gneiss natural stone pavers. Hand-edged gneiss paving stones from Maggia Valley, Ticino, were very popular in Zurich in the 1950s. In private gardens and parks, countless public squares, patios, pathways, and stepping stones were made from this long-lasting material. As the natural stone paving was often replaced with concrete and composite stone pavers in the decades thereafter, polygonal gneiss paving stones have become an element of 1950s style.

Mastic asphalt

Ganz Landscape Architects used the very old construction material mastic asphalt as a paving surface for a project where the finish was desired to stand out against the existing asphalt surround. A mastic asphalt surface without joins and with an unusually large grain was used.
Together with the Walo Bertschinger company, a special mastic asphalt was developed that, in addition to having the properties of conventional mastic asphalt surface, would satisfy the design demands of gravel and also conform to construction standards. Ganz Landscape Architects decided to add basalt stone of grain size 22/32 mm. For the paving, the pre-coated basalt gravel was spread by hand on the 5 cm thick surface layer of mastic asphalt. The maximum possible amount of gravel was spread. The base layer of the paving was conventional rolled asphalt.
Because of the chosen mechanical working of the surface, the gravel shows up optimally for the desired appearance and also provides for the desired grip and anti-skid properties. Further, this special surfacing shows very high load-bearing capacity, withstands snow plowing, is resistant to saltwater, and hinders hydroplaning. For assuring adequate water drainage, a minimum gradient of 1.5% is required.
If any later work is required on the mastic asphalt paving, for example due to work on pipelines and cables, the surface can be repaired relatively easily. The mechanical working of the surface makes transitions more uniform in appearance. Also, gravel from the spreading material should be kept in reserve for eventual required repair jobs.

Saibro®

Saibro® is used as a cement-bound surfacing for footpaths, sidewalks, and more that are permeable to water and air. Saibro® combines the robustness of concrete surfacing with the porosity of gravel surfacing. Saibro® was developed in 2000 in an interdisciplinary planning and research process by engineers, urban planners, and landscape architects to meet those needs.
For demanding projects, the load-bearing capacity and permeability of Chaussierung [macadamization] as path/road surfacing are not sufficient. To enure long-lasting surfacing quality, Ganz Landscape Architects decided to use Saibro®. For parking areas and squares Saibro® is an alternative to surfacing with mineral or biological binders. Saibro® forms a rigid slab that must be divided by joints, but the result is nevertheless a homogenous surface of firm gravel.
Installation of the material is similar to the installation of concrete. On a permeable foundation multiple layers of the surfacing can be installed. The surfacing is edged by curbs or forms. The appearance of the top layer is determined by the grain grading or by the addition of color to the binder. Pedestrian and vehicle use can lead to occasional erosions. This effect can be achieved deliberately by light washing away of the surface mortar, thus exposing the upper aggregate particle. This increases the similarity in look and feel to Chaussierung (macadamization) with spread stone or sand.

Stabilizer® Natural Soil Binder

Stabilizer® is a commercially available raw material composed mainly of plant material from the plantago family. The exact formula is withheld by the manufacturer for competition reasons, but it known that the plants are dried and ground to a fine powder. Packed in bags or sacks, Stabilizer must be kept dry in order that it can be used as binding agent in a controlled manner. Stabilizer has been used for binding surfaces in Europe since 1994 and in North America since 1982.
Ganz Landscape Architects chose Stabilizer® for a surface in one of their projects. It was chosen because of its colorlessness; only the color of the aggregate selected for use with Stabilizer determines the color of the surface. In addition, the good porosity of the surface allows trees to be a part of the design. The trees planted can be provided with good air and water balance conditions. The tree grate can be covered with the surfacing right up to the trunk, which in terms of design allows for a homogeneous, connected surface area; it also reduces weed growth. Characteristic of this natural product is its changing appearance during installation and its appearance during use. Freshly installed Stabilizer® is at first very soft. During the subsequent hardening time, which varies depending on the weather but takes at least five to 10 days, the surface should not be stepped on. Immediately after installing the surfacing it looks smooth and uniform, and over time a ca. 5 mm thick, loose, sandy layer forms on the surface. The loose material gets carried away by weather and use of the surface, so that strongly frequented areas differ in their looks from areas used less often. This predictable effect accords with our processual understanding, which includes development and aging in the lifetime of a project.

Surface treatment: Soft stone, hand-worked surfacing

Rough surface

Surface treatment: split/cut
Work tool: chisels

Photography: Pro Naturstein, 2000

Rough surface

Surface treatment: embossed
Work tool: embossing hammer

Photography: Pro Naturstein, 2000

Rough surface

Surface treatment: pointed
Work tool: pointed punch

Photography: Pro Naturstein, 2000

Fine surface

Surface treatment: pointed
Work tool: double pick

Photography: Pro Naturstein, 2000

Fine surface

Surface treatment: hewn
Work tool: slotting tool

Photography: Pro Naturstein, 2000

Fine surface

Surface treatment: toothed
Work tool: toothed plane iron

Photography: Pro Naturstein, 2000

Very fine surface, directed

Surface treatment: riffled
Work tool: riffler

Photography: Pro Naturstein, 2000

Very fine surface, directed

Surface treatment: nidged
Work tool: nidging hammer

Photography: Pro Naturstein, 2000

Very fine surface, directed

Surface treatment: planed
Work tool: toothed plane

Photography: Pro Naturstein, 2000

Very fine surface, non-directed

Surface treatment: bush hammered
Work tool: bush hammer

Photography: Pro Naturstein, 2000

Very fine surface, non-directed

Surface treatment: tooled
Work tool: roughing hammer

Photography: Pro Naturstein, 2000

Very fine surface, non-directed

Surface treatment: planed
Work tool: sandstone plane

Photography: Pro Naturstein, 2000

Surface treatment: Concrete floor, machine-worked surfacing

Rough surface

Surface treatment: sanded with `Kleweg` machine
Photography: Lothar Moser, Confirm AG, 2017

Rough surface

Surface treatment: rough sand blasted
Photography: Lothar Moser, Confirm AG, 2017

Smooth surface

Surface treatment: medium sand blasted
Photography: Lothar Moser, Confirm AG, 2017

Very smooth surface

Surface treatment: smooth sand blasted
Photography: Lothar Moser, Confirm AG, 2017

Smoothed surface

Surface treatment: machine smoothed and polished
Photography: Lothar Moser, Confirm AG, 2017

Surface treatment: Asphalt, machine-worked surfacing

Rough surface

Surface treatment: bush hammered
Aggregate: basalt, black, 7-15mm

Photography: Ganz Landscape Architects, 2011

Fine surface

Surface treatment: polished
Aggregate: basalt, black, 7-15mm

Photography: Ganz Landscape Architects, 2011

Rough surface

Surface treatment: bush hammered
Aggregate: quarry granite, light, 7-15mm

Photography: Ganz Landscape Architects, 2011

Fine surface

Surface treatment: polished
Aggregate: quarry granite, light, 7-15mm

Photography: Ganz Landscape Architects, 2011

Rough surface

Surface treatment: bush hammered
Aggregate: quartz St.L., 7-15mm

Photography: Ganz Landscape Architects, 2011

Fine surface

Surface treatment: polished
Aggregate: quartz St.L., 7-15mm

Photography: Ganz Landscape Architects, 2011

Rough surface

Surface treatment: bush hammered
Aggregate: cBudget Giallo, yellow, 5-8mm

Photography: Ganz Landscape Architects, 2011

Fine surface

Surface treatment: polished
Aggregate: cBudget Giallo, yellow, 5-8mm

Photography: Ganz Landscape Architects, 2011

Rough surface

Surface treatment: bush hammered
Aggregate: siliceous limestone black/white T, 7-15mm

Photography: Ganz Landscape Architects, 2011

Fine surface

Surface treatment: polished
Aggregate: siliceous limestone black/white T, 7-15mm

Photography: Ganz Landscape Architects, 2011

Woodcraft

Barrel making

The craft of barrel making, or coopering, has been in existence since the seventh or eighth century. The cooper’s favorite wood is oak. Oak is hard, robust, and long-lasting. The cooper uses mirror-cut or half mirror-cut wood – that is, wood that is cut vertically or at an angle to the growth rings. After the cutting the boards must be air dried. The rule of thumb is six months’ drying time per centimeter thickness before the boards can be worked.
Ganz Landscape Architects contracted a cooper to make almost square, 20 cm deep oak tubs. The tubs have a very long durability under water so that they make good tubs for water lilies in pools. Oak also releases tannins into the water, which inhibits the growth of algae on the walls of the pool.

Charcoaling

In their search for new forms of expression and uses of materials, Ganz Landscape Architects hit upon the centuries-old tradition of charcoal production. Charcoal burners traditionally built semi-circular charcoal kilns out of beech wood stacked in layers. The meter-long staves were stacked in a circle, covered with a layer of straw, and then packed airtight with earth and ashes. Depending on the size of the charcoal kiln, the production of charcoal after starting the fire and at temperatures from 400 to 500°C, could take from 8 to 14 days.
Charcoaling
  for our use consists in charring the wood using a flame. This is done by hand, for the flame is applied to create a charred layer only 15 mm deep. The charcoaling process is controlled using steam, but without allowing the boards to go out of shape. The best materials for the process are beech and oak. Pines with a lot of resin would be hardly suitable, as they are so inflammable. To prevent the charred wood from later staining clothing, the wood can be oiled.
The charring mineralized by the fire protects and preserves the wood against further decay. In bygone days, for example, the bottoms of fence posts used to be charred before they were pounded into the ground. In chemistry this process is called pyrolysis, the decomposition of organic matter by heating. This stops the weathering of the wood and makes chemical treatments unnecessary.

Modelmaking

Total view

Parc et château de Chillon

Housing construction Steinwies-/Irisstrasse, Zurich

to the project

Alter Tobelhof, Zurich

swimming bath and park Bünzmatt Eisbahn, Wohlen

Im Wäldli, Zurich

Garden courtyard, new annex at Unterlöchli Nursing Home, Lucerne

to the project

handcraft

Glassblower

Glasworks by Matteo Conet, Basel

Glasworks by Matteo Conet, Basel

Foundry

Foundry H. Rüetschi AG, Aarau