Guide to a Healthy Lawn
Caring for Your Lawn in an Environmentally Friendly Way
Picture a healthy green lawn: perfect for lounging around, great for ball games and BBQs, a real asset to your home. But did you know that your lawn - and how you take care of it - could also help the environment? Healthy grass provides a feeding ground for birds, which find it a rich source of insects, worms, and other food. Thick grass prevents soil erosion, filters contaminants from rainwater, and absorbs many types of airborne pollutants, like dust and soot. Grass is also highly efficient at converting carbon dioxide to oxygen, a process that helps clean the air.
Caring for your lawn properly can both enhance its appearance and contribute to its environmental benefits. You don't have to be an expert to grow a healthy lawn. Just keep in mind that the secret is to work with nature. This means creating conditions for grass to thrive and resist damage from weeds, disease, and insect pests. And if you choose to use pesticides, it means using them with care so as to get the most benefit and reduce any risks. Caring for your lawn in an environmentally sensible way can have a bigger impact than you might think. Your lawn is only a small piece of land, but all the lawns across the country cover a lot of ground. That means you and your lawn care activities, along with everyone else's, can make a difference to the environment. And that's why taking care of the environment begins in our own back yards.
Working With Nature: A Preventive Health Care Program for Your Lawn
To start with, think about lawn care as a preventive health care program, like one you would use to keep up your own health. The idea is to prevent problems from occurring so you don't have to treat them. As they say, an ounce of prevention is worth a pound of cure. A healthy lawn can out compete most weeds, survive most insect attacks, and fend off most diseases - before these problems ever get the upper hand.
Your lawn care program should be tailored to local conditions - the amount of rainfall you get, for example, and the type of soil you have. But no matter where you live, you can use the program outlined in this article as a general guide to growing a healthy lawn.
A preventive health care program for your lawn should have the following steps:
Develop Healthy Soil
Good soil is the foundation of a healthy lawn. To grow well, your lawn needs soil with good texture, some key nutrients, and the right pH, or acidity/alkalinity balance.
Start by checking the texture of your soil to see whether it's heavy with clay, light and sandy, or somewhere in between. Lawns grow best in soil with intermediate or "loamy" soils that have a mix of clay, silt, and sand. Whatever soil type you have, you can probably improve it by periodically adding organic matter like compost, manure, or grass clippings. Organic matter helps to lighten a predominantly clay soil and it helps sandy soil retain water and nutrients.
Also check to see if your soil is packed down from lots of use or heavy clay content. This makes it harder for air and water to penetrate, and for grass roots to grow. To loosen compacted soil, some lawns may need to be aerated several times a year. This process involves pulling out plugs of soil to create air spaces, so water and nutrients can again penetrate to the grass roots.
Most lawns need to be fertilized every year, because they need more nitrogen, phosphorus, and potassium than soils usually contain. These three elements are the primary ingredients found in most lawn fertilizers. It's important not to over-fertilize - you could do more harm to your lawn than good - and it's best to use a slow-release fertilizer that feeds the lawn slowly. It's also important to check the soil's pH. Grass is best able to absorb nutrients in a slightly acidic soil, with a pH of 6.5 to 7.0. Acidic soil can be "sweetened" with lime; soil that's not acid enough can be made more sour by adding sulfur.
Have your soil tested periodically to see whether it needs more organic matter or the pH needs adjusting. If a professional service takes care of your lawn, make sure it takes these same steps to develop good soil. There's no getting around it: your lawn's health is only as good as the soil it grows in.
Choose a grass type that thrives in your conditions
The right type of grass - one that suits your needs and likes the local weather - will always give better results. Grasses vary in the type of climate they prefer, the amount of water and nutrients they need, their resistance to pests, their tolerance for shade, and the degree of wear they can withstand.
If you are putting in a new lawn, it will be worth your while to do some research to identify the best grass type for your needs.
If you're working with an established lawn that fails to thrive despite proper care, you might consider replanting with a different type of grass.
Why struggle to grow grass that's susceptible to fungal disease if you live in a humid climate? Or a water-loving species if you live in an area with water shortages? Grass that is well adapted to your area will grow better and resist local pests and diseases better.
Mow higher, Often and with Sharper Blades
Mowing high - that is, keeping your lawn a bit longer - will produce stronger, healthier grass with fewer problems.
Longer grass has more leaf surface to take in sunlight. This enables it to grow thicker and develop a deeper root system, which in turn helps the grass survive drought, tolerate insect damage, and fend off diseases. Longer grass also shades the soil surface keeping it cooler, helping it retain moisture, and making it difficult for weeds to germinate and grow.
A lawn's ideal length will vary with the type of grass, but many turf grass species are healthiest when kept between 1-1/2 and 3-1/2 inches. You may have to readjust your mower - most are set too low.
It's also important to mow with sharp blades to prevent tearing and injuring the grass. And it's best to mow often, because grass adjusts better to frequent than infrequent mowing. The rule of thumb is to mow often enough that you never cut more than one-third of the height of the grass blades. Save some time and help your lawn and the environment by leaving short clippings on the grass - where they recycle nitrogen - rather than sending them in bags to the landfill.
You don't have to grow a foot-high meadow to get good results. Just adding an inch will give most lawns a real boost.
Water deeply but not too often
Watering properly will help your lawn grow deep roots that make it stronger and less vulnerable to drought. Most lawns are watered too often but with too little water. It's best to water only when the lawn really needs it, and then to water slowly and deeply. This trains the grass roots down. Frequent shallow watering trains the roots to stay near the surface, making the lawn less able to find moisture during dry periods.
Every lawn's watering needs are unique: they depend on local rainfall, the grass and soil type, and the general health of the lawn. But even in very dry areas, no established home lawn requires watering daily.
Try to water your lawn in a way that imitates a slow, soaking rain, by using trickle irrigation, soaker hoses, or other water-conserving methods. It's also best to water in the early morning, especially during hot summer months, to reduce evaporation. Apply about an inch of water - enough that it soaks 6-8 inches into the soil. Then let the lawn dry out thoroughly before watering it again.
The best rule is to water only when the lawn begins to wilt from dryness - when the colour dulls and footprints stay compressed for more than a few seconds.
Scarify to reduce thatch
All grass forms a layer of dead plant material, known as thatch, between the grass blades and the soil. When thatch gets too thick - deeper than one-half inch - it prevents water and nutrients from penetrating to the soil and grass roots. Some grasses tend to form a thick layer of thatch. Overuse of fertilizer can also create a heavy layer of thatch.
You can reduce thatch by raking the lawn or using a machine that slices through the thatch layer to break it up. This is known as scarifying. Sprinkling a thin layer of topsoil or compost over the lawn (top-dressing) will also help.
In a healthy lawn, micro-organisms and earthworms help keep the thatch layer in balance by decomposing it and releasing the nutrients into the soil.
Setting realistic goals will allow you to conduct an environmentally sensible lawn care program. It's probably not necessary to aim for putting-green perfection. Even a healthy lawn is likely to have some weeds or insect pests. But it will also have beneficial insects and other organisms that help keep pests under control.
Also realise that grass just can't grow well in certain spots. Why fight a losing battle with your lawn, when you have other options? At the base of a tree, for example, you might have better luck with wood chips or shade-loving ornamental plants like ivy or periwinkle. If your conditions are very dry, consider converting some of your lawn to dry-garden landscaping. It could save time, money, and water resources.
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