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Sustainable Landscaping
Zero Waste You Make It Happen!
As our nation grows, communities use more resources and generate more
waste. Environmental agencies are looking closely at urban landscapes
for solutions to long-term pollution problems. Consequently, legal
restrictions are being placed on landscape design and maintenance
practices.
Role of Landscape Managers
Landscape contractors and site managers can play an active role in
efficiently managing resources, reducing waste, and preventing
pollution. With forethought and planning, they can maintain and design sustainable landscapes and make them cost-effective and
environmentally sound.
What Are Sustainable Landscapes?
Sustainable landscapes are managed by using practices that preserve
limited and costly natural resources, reduce waste generation, and help
prevent air, water, and soil pollution. The goal is to minimize
environmental impacts and maximize value received from dollars
expended.
What Are the Benefits?
When landscapes require excessive amounts of water, energy, labor, and
other resources, environmental and economic costs outweigh many of the
natural benefits of urban landscapes.
In contrast, sustainable landscapes feature healthier, longer-lived
plants that rely less on chemical pesticides and fertilizers, minimize
water use, and reduce waste generation and disposal. They also require
less maintenance and alleviate groundwater and air pollution problems.
Using Sustainable Practices
Sustainable landscapes mean more than hot, dry gardens of cactus and
gravel. They can incorporate beautiful plants, shrubs, and trees and
reduce maintenance costs while at the same time protect the
environment.
Using sustainable landscape maintenance practices makes good business
sense. Using the practices outlined in the following sections will
reduce resource depletion, waste generation, and pollution problems
while also improving the health of the landscape in an aesthetically
pleasing and cost-effective manner.
Build Healthy Soils
Healthy soils are essential in urban landscapes. Organic matter
additions (compost or humus) can transform poor soils into a fertile
growth medium that supports healthy plant growth while reducing water
and fertilization requirements. Healthy disease- and pest-resistant
plants improve landscape appearance and increase property values.
Use Mulch
Use shredded or chipped plant materials with an appropriately high wood
content as mulch cover over the soil in planting beds and other bare
areas in the landscape. Mulch will insulate plant roots, reduce weeds,
minimize water loss, and control erosion, dust, and mud problems.
Decomposition of mulch helps condition the soil and adds nutrients.
Irrigate Efficiently
Over watering aids rapid plant growth and runoff adds to groundwater
pollution. Use water-efficient irrigation systems, such as drip or
low-output sprinkler heads, that deliver a precise volume of water to
plant root zones. Develop watering schedules based on historical or
actual weather data. Use soil probes to monitor soil moisture before
watering.
Limit Fertilization
Applying precise amounts in a timely manner will reduce growth,
diminish the potential for pollution, and promote healthy disease- and
pest-resistant plants. Fertilize according to the needs of the species
planted. Use slow-release or organic-based formulas based on nutrient
needs as verified by soil testing. This will reduce growth spurts that
increase the need for pruning and mowing.
Grasscycle Turf Areas
Use mulching mowers that leave grass clippings on the lawn when mowing.
Grass clippings will decompose quickly and release valuable nutrients
back into the soil. This will reduce water and fertilizer usage and
green waste generation as well as maintenance costs. Moderate growth
through proper turf management will produce short clippings that will
not cover the grass surface.
Prune Selectively
Excessive and haphazard pruning of shrubs and trees is wasteful and
unhealthy. Pruning should be limited to maintain natural growth
patterns. Hedging, topping, and shearing of landscape plants into
formal shapes only encourage excessive new growth. Using natural
pruning techniques at the proper season will promote healthier plants
and also reduce “suckering” and stabilize growth.
Reuse Organic Materials On-Site
Landscapers can use a chipper at the job site to mulch prunings and
clippings from woody shrubs and trees and apply mulch on the landscape.
Trimmings and clippings from lawns, trees, and shrubs from large
landscape sites can become feedstock for on-site composting operations.
This will save on purchasing outside soil amendments.
Recycle Organic Materials Off-Site
If lawn clippings, shrub and tree trimmings, or prunings must be
removed from landscape sites, they should be transported to a local
composting facility or green waste processor for recycling. When
purchasing mulches and composts, consider products with the highest
recycled green waste content to support and sustain long-term market
demand.
Practice Pollution Prevention
Landscape managers are encouraged to use Integrated Pest Management to reduce use of chemical pesticides and herbicides. These
chemicals can eventually make their way off-site and contribute to
nonpoint source pollution (pollution not traceable to a single
location). Increased use of non-motorized equipment will also reduce
emissions and noise pollution.
Retrofit Inefficient Landscapes
As established landscape sites age or grow beyond their intended use,
they must be redesigned to integrate resource efficiency, site
function, and aesthetics. Reduce turf areas and establish new landscape
plantings with more low-maintenance and drought-tolerant plants.
Irrigation systems must undergo retrofits and depleted soils enriched
to save water and promote healthy plant growth.
Upgrade Contract Specifications
A good landscape maintenance program requires a contract that provides
for and promotes the use of sustainable practices. Site managers and
contractors should develop and use sustainable landscape maintenance
contract specifications that are resource-efficient. They should
include good cultural practices, water management, green waste
management, and preventative maintenance management clauses.
Think Recycle/Buy Recycled
Recycling materials from the construction, installation, or upkeep of
landscape sites will reduce waste. Wood waste coverts to mulch and
plastic pots can be recycled into products for landscape use. Buying
recycled-content landscaping products, such as plastic edging or
lumber, conserves natural resources and strengthens markets for these
recyclable materials.
Resources Available from CIWMB
at www.ciwmb.ca.gov
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