sustainable design concepts

7/29/2019 Sustainable Design Concepts

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EC 1533ReprintedMay 2002

$2.00

Prepared by

Ann Marie

VanDerZanden,

Extension Master

Gardener state

coordinator, and

Jan McNeilan,

Extension agent

(home horticulture),

Multnomah County;

Oregon State

University.

Basic Design ConceptsforSustainable LandscapesA.M. VanDerZanden and J. McNeilan

A sustainable landscape is more than the conscious arrangement ofoutdoor space for human enjoyment and satisfaction. It is a landscapethat uses minimal water, fertilizers, pesticides, labor, and building

materials. Creating a sustainable landscape means working toward athoughtful balance between resources usedboth in construction and mainte-nanceand results gained.

Sustainable landscapes require as much, if not more, planning as traditionallandscapes. However, many traditional landscapes already contain some compo-nents of sustainability. The checklist on page 3 can help you evaluate yourlandscapes sustainability.

As you plan your landscape, think about your entire property and what youwant to achieve. During each step in the process, think about ways to incorporatesustainability into your design (e.g., by selecting plants wisely, using recycledbuilding materials, and limiting your use of plants with high fertilizer, water, ormaintenance requirements).

The most common steps in developing a landscape include:w Drawing a scale map (plot plan) of the property

w Completing a site analysis and assessing family needs

w Determining use areas

w Brainstorming alternative layouts and design ideas

w Creating a scaled drawing of the design (landscape plan)

w Selecting plants

A master plan is essential to ensure that all work done on the property willblend into the desired final outcome. Keep in mind that landscape development

can be a long-term process. There is no need to develop your entire lot at once;completing the landscape over a 5-year period might be more feasible. This timeframe allows you to evaluate plants as they grow and mature and generally ismore financially manageable.


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Drawing a scale mapof the property

Prepare a scale map of your property (Figure 1).Use graph paper and let one square equal a certainnumber of feet. Or use a ruler or engineers scale as

follows:

Suggested scaleSuggested scaleSuggested scaleSuggested scaleSuggested scale Small lotSmall lotSmall lotSmall lotSmall lot Large lotLarge lotLarge lotLarge lotLarge lotEngineer 1 inch = 10 ft 1 inch = 20 ftRuler 1 inch = 8 ft 1 inch = 16 ft

The map should include:w Property lines

w North arrow

w Scale used

w Contour of the land (Use an arrow to show

direction of surface water flow.)w Location of existing landscape features: house,

garage, buildings, trees, walks, and driveways

w Doors, windows, porches, and rooms of thehouse

w Septic tank, sewer lines, and undergroundpower lines

w Views (Point arrows in the direction of each

good view.)

w Undesirable features of your own or adjoiningproperty

Completing a site analysis andassessing family needs

A thorough site analysis can help you enhanceor maintain your propertys sustainability, as ittells you what you have to work with on the site. Asite analysis also can shed new light on an existing

landscape before you begin a renovation project. Acomprehensive understanding of your site condi-tions is important, because in a sustainablelandscape both native and introduced plants mustbe well suited to existing light, moisture, and soilconditions. Part I of the Landscape design plan-ning questionnaire on pages 1012 includesseveral questions to help with your site analysis.

Parts II and III of the questionnaire address theneeds and preferences of the people who will usethe landscape. Age of family members, types of

pets, and personal plant preferences are important,as is determining whether there is a need forlighting or areas for entertaining or storage. Youmight want to add additional questions pertinentto your own situation.

Determining use areasA landscape is composed of areas that are used

for different purposes. Examples include the publicuse area, usually in the front of the house; theprivate use or family area, often in the back of the

house; and the service area, generally in the back orside yard (Figure 2). It is important to design eacharea so that it meets the familys needs, contributesto an attractive overall landscape, and capitalizeson sustainability concepts.

Public areaThis is the area that is visible from the street.

The house should be the focal point of the publicFigure 1.Property map.

Property line

View of woodsNeighbors

vegetable garden

Low, needs fill

Neighbors

house

Drainage

Sewer line

SidewalkPlanting strip

Road

Existing

maple

Existing

maple

Property

line

Neighbors

houseDrainage

Neighbors

undeveloped

yard

Existingpin oak

GK

DR

P

LR

HS

N


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Evaluating landscapesustainability

Many home landscapes already containsome aspects of sustainability. However, most

can benefit from a critical review and someimprovement. Use the following checklist as aguide to determine how sustainable yourlandscape is.O What are the environmental benefits of

the landscape?

O Are mulches used to maintain soilfertility and earthworm activity?

O Were plants selected properly to reducethe need for pruning, spraying, and

fertilizing?O Are plants placed in ideal growing

conditions (e.g., correct light anddrainage)?

O Were plants sited properly so that, whenmature, they complement rather thancompete with each other?

O Have drainage problems been correctedto provide adequate water penetration?

O Was the landscape planned to help

prevent erosion?O Has water runoff been handled properly?

O Has the landscape been developed toreduce the need for high-nitrogenfertilizers?

O Does plant selection take into consider-ation the effect of sunlight on thehouseholds summer cooling and winterheating needs?

O Has the landscape

created a betterenvironment forpeople?

O Does the landscapeattract beneficialwildlife?

area design. The landscape should be simple anduncluttered and create a sense of spaciousness.Keep the lawn or groundcover open and placeshrubs to the sides of the house and in beds next tothe house, not in isolated beds surrounded by turfor groundcover. Placing tall trees in the backyardand medium-size ones on the sides and in front willhighlight the house.

When selecting shrubs to frame the front door,consider their texture, color, size at maturity, andshape. They should enhance the total visual effectand should not block doors or windows.

Private area or family areaThe private area, often called the outdoor living

room, is an important part of the American home.To maximize use of this area, it should be easily

accessible from the house and should be designedto meet the familys needs. Often a patio or deck ispart of this area, as well as a grouping of outdoorfurniture or a cooking space. The size of the areadepends on how it will be used. A 10' x 10' areaholds four chairs and is about the minimum sizefor comfortably accommodating four people.

Consider using recycled materials or productsmade from renewable resources for the patio ordeck. (See publication EC 1535 for more informa-tion.) Features such as motion sensor lights will

increase the areas usefulness. Other issues toconsider include privacy, year-round interest,climate control, and a childrens play area.

PrivacyProperly grouped shrubs and trees create a sense

of enclosure and screen the area from public viewand nearby neighbors. For a small area, tall con-tainer plantings or a trellis or fence covered withvines can create a sense of privacy.

Figure 2.Use areas in a landscape.

Public area Public area Public area

House House House

Private

area

Private

area

Private

areaServicea

rea

Servicea

rea

Service

are

a


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Year-round interestYear-round interest is important throughout the

landscape, but especially so in the private use area,particularly if the area is visible from the house.Evergreen trees, shrubs, and vines; plants withcolorful bark or fruit; and perennials that keeptheir foliage or flowers through the winter are goodselections. Small plantings of annuals and bulbscan provide additional color during the growingseason. Pools, stone steps, paving, walls, birdfeeders and baths, and other architectural featurescan provide additional interest.

Climate controlWeather control extends the

outdoor living areas usefulness.Evergreen trees provide year-

round screening and shade.Well-placed deciduous trees canscreen the area from hot summersun, while allowing maximumwinter sun for solar heat. Anawning or a trellis covered withplants can protect againstinclement weather. If spaceallows, a pool or fountain canconvey a sense of coolnessduring summer, with the addedbenefit of attracting wildlife.

Childrens play areaThe play area can be part of

the outdoor living area orseparate from it. Consider yourchildrens ages and activities todetermine the size and surface ofthe play area. For very youngchildren, a small area enclosedby a fence near the kitchen orpatio/deck is desirable. As

children grow up, you will needto adjust the design to meetchanging recreational needs.

Service and work areasAn area screened from major

views is needed for service andwork area(s). Examples includespace for compost piles, garbage

cans, tool and wood storage, plant propagatingstructures, and dog runs. A dense planting ofshrubs, a vine on a trellis, or a fence can obscurethis area from the rest of the landscape.

Brainstorming alternativelayouts and design ideasDetermine which use areas are appropriate for

your design. Lay a piece of tracing paper over yourplot plan and draw bubble diagrams to representthe different use areas (Figure 3). Fit them together

Figure 3.Placing use areas on a map.

VegetablesLiving

Existing

pin oak

Private

side yard

Childrens play

Laundry

DrivewayPublic

Existing

maple

Existing

maple

Sidewalk

Planting strip

Road

G

K

S

DR

LR

P

H

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considering traffic flow and how the space will beused. How will people move from one area to

another? How will people move from the houseinto the landscape?Try different combinations in relation to rooms

of the house, surrounding areas, and potentialviews. This brainstorming process will help youvisualize various layouts and is an important stepin exploring possible design options.

Because each landscape is unique, there are nohard and fast rules for design. However, certaindesign principles will help you create an aestheti-cally pleasing and sustainable landscape. Theseguidelines will help beginners create a functionallandscape. The extent to which you follow them isup to you and your artistic style.

Standard landscape design principles include:w Simplicity

w Rhythm and line

w Balance

w Proportion

w Focal point

SimplicitySimplicity in a landscape can be physical, visual,

or both. Physical simplicity refers to a design thatconsists of simple bed lineseither straight orgently curvedwith no complex geometric shapesor patterns. Visual simplicity is achieved whenplants are arranged to appear as a single unit. Forexample, you can group three or more plants of thesame species to create one visual mass (Figure 4).

Landscapes that lack simplicity can look chaotic

and do not create a sense of peace.

Rhythm and lineContinuity and integration of different elements

into a landscape affect rhythm and line. Effectiveuse of repetition can direct the eye or a personthrough the landscape and create a sense of unityamong different spaces (Figure 5).

BalanceThe two common types of balance in landscapes

are symmetrical and asymmetrical. Symmetricalbalance is most common in formal landscapes.These landscapes have an obvious central axis, andeverything on one side is duplicated or mirrored onthe other side. Asymmetricalbalance uses differentobjects on each side of a discrete axis, but the endresult still is a similar visual mass on both sides(Figure 6, page 6). Asymmetrical designs are wellsuited for home landscapes.

Figure 4.Lack of simplicity (left) and simplicity (right). Although there are more elements in thelandscape on the right, they are grouped to create a simpler design.

Figure 5.Rhythm and line. The eye is directedtoward the house by the plantings.


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ProportionThis principle refers to the size relationship

between elements within a landscape. The majorrelationships to consider are plants to buildings,plants to other plants, and plants to people.Proportion changes over time as plants grow. To

achieve correct proportion, always design yourlandscape based on the mature height and spreadof the plants. Although plants might be a little outof scale when they are young, they will grow intoproportion with other objects in the landscape.

Resist the temptation to overplant. Otherwise,you will have to remove many of the plants toprevent overcrowding.

Focal pointFocal points give the eye a place to rest when

viewing the landscape as a whole. A focal pointmight be a plant specimen, garden accessory, orwater feature. The front door is an example of afocal point in the public area.

Both the public and private use areas shouldhave a focal point. If the area is large and dividedinto a number of smaller spaces, multiple focalpoints are needed.

Creating a scaled drawingof the design

Landscape designs generally are drawn in planview. This means they are two-dimensional anddrawn from a birds-eye view of the site. As youmove into the final step of the design process,begin drawing landscape symbols (Figure 7) on thetracing paper to represent identifiable landscapeelements. Dont worry about selecting specificplants yet; a label of deciduous tree or a mass

representing perennials is sufficient. You willselect the specific plants in the final step.

After you have developed the final draft of your

design, take a few minutes to answer the followingquestions to make sure youve covered everything.It is a lot easier to make changes at the design stagethan when you are digging holes for plants orexcavating for a patio!w Is the driveway design pleasing, useful, and safe?

Is the entrance easily accessible? Is there aturnaround? guest parking?

w Are walkways convenient? Are guests directed tothe front door?

wWill the landscape be attractive from the livingroom? picture window? porch? dining room?Will it be attractive all year?

w Is there a private living area? Is it screened fromneighbors? from the service area? from otherbuildings?

w Are the gas meter, power meter, and oil tankeasily accessible and, if necessary, screened frompublic view?

Figure 7.Landscape symbols.

Deciduous

tree

Single shrub

Shrubs

Combination border

Clipped hedge

Unclipped hedge

Fence and gate

Stepping-stone walkGroup of three trees

Evergreen

tree

Flowers

Figure 6.Symmetrical balance (left) and asymmetrical balance (right).


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wWill tree and shrub planting locations interferewith the septic tank, sewer lines, or drainagefields? Will excavating for a patio interfere withthese elements?

w Do all parts of the landscape fit together into a

unified plan?

When you have completed this step, your designshould be fairly well defined and look somethinglike Figure 8.

Selecting plantsWhen you begin drawing the final plan, you will

select specific plants and represent them withlandscape symbols. These symbols should bedrawn to scale and should represent themature spread of the plant. For example,assume you are uing a ruler and a scale of1"=16'. You want to draw a maple treewith a mature spread of 20'. You will needto draw a circle with a diameter of 114".

Although plant selection can bedaunting, it also is enjoyable. There aremany reference books to help you. Manynot only describe each plants height,spread, leaf and flower color, but alsohighlight water, fertilizer, maintenance,and adaptability characteristics. Below

are some basic guidelines to considerbefore you consult a reference book.

See publication EC 1534 for moreinformation on selecting plants forsustainable landscapes.

Aesthetic considerationsConsider each plants texture, seasonal

foliage color, flowers, fruit, and bark.When possible, select plants that provideyear-round interest. For example, choose

a tree, such as a river birch, that hasattractive spring flowers, beautiful fall ormidsummer color, and exfoliating(shedding) bark for winter interest.

By selecting plants that bloom atdifferent times, you can have colorthroughout the year. Flowering treesprovide pastels in spring; beds ofperennials and annuals furnish vivid hues Figure 8.Sample landscape plan.

Vegetables

Sandbox

Laundry

Flowers

Living area

Existing

pin oak

P

LR

DR

H

K

S

G

Lawn

Existing

maple

Existing

maple

N

Sidewalk

Road

in summer; trees and shrubs whose leaves turnyellow, orange, or crimson brighten gray autumndays; and the bark and fruit of some species areattractive throughout the winter. Strongly contrast-ing textures also can create interesting year-roundeffects.

Mature sizeConsider the mature size of plants you select for

your landscape. A common mistake is to selectplants that soon become too large for their loca-tionfor example, large junipers planted underpicture windows. These plants require regular anddrastic pruning in order to preserve the view fromthe window. The resulting maintenance costs and


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excess green waste reduce the landscapessustainability. Additionally, drastic pruning oftenreduces the specimens natural grace and beauty. Abetter alternative is to plant a small shrub whosemature height will be below the window. This plantwill require minimal, if any, pruning and willmaintain its natural shape.

Plant formPlants grow in many forms, or shapes. Incorpo-

rate a variety of forms into the landscape to createvisual interest. Some common forms of shrubs andtrees are shown in Figure 9.

Plant textureA plants texture depends on the size of its leaves

and stems and their three-dimensional arrange-

ment. Plants with large, widely spaced leaves andthick stems (e.g., bigleaf hydrangea) have a coarsetexture. Plants with small, closely spaced leavesand thin stems (e.g., boxwood) have a fine texture.Although some variation in texture is needed tomake a landscape interesting, avoid numerouscombinations of plants with extremes in texture.

Because deciduous plants lose their leaves in thefall, be sure to consider their stem size and arrange-ment. Densely branched deciduous shrubs such asspirea and honeysuckle might work as a screen

even after their leaves have dropped.After you have selected the plants, the final stepis to label them on your drawing and create aplanting key (Figure 10). It is important to remem-ber, however, that landscapes are a work inprogress, and change often is necessary to enhancetheir beauty and usefulness.

For more informationConserving Water in the Garden: Designing and

Installing a New Landscape, EC 1530 (2001). $1.00

Deer-resistant Ornamental Plants, EC 1440 (1994). 75

Gardening with Beneficial Insects, PNW 550 (reprinted

2002). $1.00Gardening with Fewer Pesticides: Integrated Pest

Management, EC 1532 (2001). $2.00

Hardscape Materials for Sustainable Landscapes:Patios, Decks, and Walkways, EC 1535 (2001). $1.00

Plant Materials for Landscaping: A List of Plants for thePacific Northwest, PNW 500 (1999). $2.50

Plant Selection for Sustainable Landscapes, EC 1534(2001). $1.50

Selecting, Planting, and Caring for a New Tree, EC 1438(reprinted 1997). $2.00

Southwestern Oregon Tree Selection Guide for Coos,Curry, Douglas, Jackson, and Josephine Counties,EC 1505 (1999). $5.50

Sustainable Gardening: The OregonWashingtonMaster Gardener Handbook, EM 8742 (reprinted

2002). $22.00

To order copies of the above publications, send thecomplete title and series number, along with a check ormoney order for the amount listed (payable to OregonState University), to: Publication Orders, Extension& Station Communications, Oregon State University,422 Kerr Administration, Corvallis, OR 97331-2119(Fax: 541-737-0817).

World Wide WebYou can access our Publications and Videos

catalog, many of our publications, and additionalgardening information on the Web at eesc.orst.edueesc.orst.edueesc.orst.edueesc.orst.edueesc.orst.edu

Figure 9.Plant forms.

Pyramidal Round Columnar Rounded Vase

Irregular Prostrate Mound or spreading Oval Pendulous
http://eesc.orst.edu/http://eesc.orst.edu/http://eesc.orst.edu/http://eesc.orst.edu/http://eesc.orst.edu/http://eesc.orst.edu/


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Figure 10.Landscape plan with planting key.

Vegetables

Laundry G

KLR

P

DR

Sidewalk

Road

Planting key1. Japanese yew2. Japanese holly3. Boxwood4. Barberry5. Azaleas6. Pin oak7. Pink dogwood8. White dogwood9. White pine

10. Chinese holly

11. Perennial border12. Abelia13. Flowering quince14. Nandina15. Flowering crabapple16. Lilac17. Existing maple

1 1 1 13 3

2 2

2

2

2

22

2

22

4

5

5

17 17

15

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Landscape design planning questionnaireThis questionnaire will help you organize your thoughts when designing or renovating your

landscape. It may bring to mind topics you have not considered and will give you a better ideaof how to design a landscape to meet your needs.

Site informationFirst, gather information about your existing yard to see how it will affect your plan.

Color of house: _____________________________________________________________________

Architectural style: _________________________________________________________________

Desirable views: ____________________________________________________________________

Undesirable views:__________________________________________________________________

Overhead utilities: __________________________________________________________________

Unique features: ____________________________________________________________________

Soil: Clay Decomposed granite Sandy Rocky Hardpan Rock shelf

Direction of winds: Summer _________ Winter___________

Are wind screens needed? Yes No Where? ______________________________________

Are sound buffers needed? Yes No Where? ____________________________________

Are there elevation differences? Minimal Moderate Severe slopes

Are retaining walls needed? Yes No Where? ____________________________________

Are there soggy areas (high water table)? Yes No Where? ________________________

Where will water drain? ____________________________________________________________

Is a French drain required? Yes No

Sun exposure: ______________________________________________________________________

Where is your yard too hot in the summer? ___________________________________________

Existing trees, shrubs, and surface roots______________________________________________

Existing site features and structures __________________________________________________

Existing walks: Brick Cement Gravel Stone Bark

Is there a parking strip? Yes No Where? ________________________________________

Preferred level of maintenance: High Medium Low

continues on next page


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Landscape design planning questionnaire (continued)

Design considerationsNow, consider how the landscape will be used.

Who will use your yard? Adults Children Elderly Pets

Preferred style: Formal Semiformal Informal

Theme (e.g., English, Oriental, or natural) ______________________________________

Preferred shapes (for lawns, walks, decks): Rectangular 45 angles Circles

Straight lines Curving/free-form Combination

Type of front entryway: Straight to the door Meandering Private courtyard

Outdoor structures/features: Patio roof Raised planters Childrens play area _____

Satellite dish Dog pen/run Storage shed BBQ area Gazebo

Deck Fence Swimming pool Spa/hot tub Sculpture

Boulders Dry creek Mounds/berms Pond Bench Fountain _____________

Waterfall and stream Greenhouse Other ___________________________________

What size patio/deck do you need? 24 people 48 people

812 people 12+ people

Do you want walkways connecting parts of your yard? Yes No

Do you want outdoor lighting? Landscape Security

What items need storage space? Garden equipment Garbage cans

Other_______________________________________________________________________

Do you need off-street parking for guests? Cars RVs Other _____________________

How will you water? Garden hose Sprinkler system Drip irrigation

Do you have photographs of your yard? Yes No(Photos can help you visualize what you want.)

Other comments:

continues on next page


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2001 Oregon State University.

This publication was produced and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914. Extension work is a cooperativeprogram of Oregon State University, the U.S. Department of Agriculture, and Oregon counties. Oregon State University Extension Service offerseducational programs, activities, and materialswithout discrimination based on race, color, religion, sex, sexual orientation, national origin, age,marital status, disability, or disabled veteran or Vietnam-era veteran status. Oregon State University Extension Service is an Equal OpportunityEmployer.

Published June 2001. Reprinted May 2002.

Landscape design planning questionnaire (continued)

PlantsFinally, think about the types of plants that will meet your needs.

What type of plants do you like?

Broadleaf evergreen trees and shrubs: Flowering Nonflowering

Deciduous trees and shrubs: Flowering Nonflowering

Conifer trees Fruit trees Shade trees Junipers Vines Roses

Annual flowers Perennial flowers Vegetables Herbs

Other_______________________________________________________________________

Do you like fragrant plants? Yes No

Favorite colors: ___________________________________________________________________

Least favorite colors: ______________________________________________________________

How much lawn do you want? None Small Average Large

Where will the lawn be? __________________________________________________________

Is anyone in your family allergic to specific plants? Yes No

Is anyone in your family allergic to bees? Yes No

Are deer a problem? Yes No

What special garden areas do you want? Vegetables Annuals Roses

Perennials Herbs Wildlife/native Orchard Shade

Rock garden Cut flowers Fragrance Wheelchair-accessible

Other_______________________________________________________________________

Other comments:

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