Organic fertilizers are another effective way to give your lawn an occassional boost during the growing season. Available at most garden centers, they contain natural ingredients such as seaweed for potassium, bone meal for phosphorous, and feather meal for nitrogen. Unlike conventional fertilizers, which deliver a heavy, instant dose of synthetic nitrogen (as well as phosphorous and potassium) for your lawn to binge on, Turkey says organics provide an easier-to-handle diet of nutrients that are released more slowly.
The thicker your grass, the more easily it can crowd out weeds. So once your soil's been treated, overseed the lawn using an appropriate turf grass (ask your garden center for recommendations). Choose a seed mix that cuits your climate, sun/shade conditions, and moisture needs, and make sure it blends well with your existing lawn. Water daily until new growth is established.
Looking for a 'Greener' Grass?
You can make your lawn even more sustainable by overseeding it, or completely replacing it, with native or organice grass seed. Las year, DLF Organic (Dlforganic.com) became the first U.S. company to offer USDA-certified organic lawn seed, grown without synthetic pesticides, herbicides, or fertilizers. The company offers three seed mixes: one for sun, one for shade, and one that's mixed with nitrogen-providing clover. Another "green" option is using native turf-grass seed. Since these seeds are familiar with their regional soil conditions and average rain fall, they require less water and are more disease-resistant than nonnatives, such as Kentucky bluegrass (from Europe) and St. Augustine grass (from Africa). The best known is buffalograss. a native prairie grass that extremely drought-resistant and, since it's low-growing, only needs to be mowed about once a month. (For more info, visit Pawneebuttesseed.com) Researchers at a few universities throughout the U.S. are exploring the potential of other native grasses for use as turf grass, including blue grama, a warm-season grass thats native to the Great Plains and Southwest, and Idaho bentgrass, which is native to the western United States ans shows promise as a sustainable turf in dryer climate.
Whacking Weeds and Pests
We're not gonna lie to you. Making the transition to organic lawn care might mean dealing with some weeds-at least for the first year or two as your soil and grass gain enough strength to control them naturally. One thing you can do to prevent weeds is spread corn gluten meal-an organic weed preventative-on your lawn in the spring. Just don't do it when you're overseeding, since it prevents germination of all seeds, including grass. While corn gluten meal works only 65 percent as well as chemical herbicides, it can still significantly reduce weed infestations.
If a few isolated weeds show up, pull them by hand or try an organic weed killer, such as Nature's Avenger, a spray containing citrus oil, which dehydrates weeds down to the roots. Some gardeners swear by vinegar to do the same.
Weeds can be helpful indicators of specific problems with your soil, however. Got crabgrass? It can point to soil compaction, since it usually appears in highly trafficked areas, such as along driveways or walkways. Instead of zapping it with pesticides, get to the root of the problem by aerating the area where it's growing. "You can kill the messenger all day long," says Turkey, "but it doesn't chacnge the message that something is wrong with your soil." And not all weeds are out to destroy your lawn; some can even help it. Clover, for example, is a common broadleaf weed that works as a natural fertilizer factory, transforming nitrogen in the air into a digestable form for your soil. Some organic-lawn-care experts actually recommend adding a pound of clover seed for every 1000 square feet of lawn.
Insects and fungal diseases can also point to lawn problems. Chinch bugs are attracted to dry, drought-stressed lawns; and watering at night, especially in warm weather, can encourage fungal diseases like dollar spot or brown patch, since turf stays moist for longer.
There are organic solutions in the battle of the bugs, too. For example, beneficial nematoads can take care of grub worms, which chew through grass roots. These spray-on microscopic organisms target-and devour-grubs and grubs only, never harming beneficial organisms, though the timing of their appplication is critical.
Care and Maintenance
When it comes to mowing a naturally grown lawn, conventional wisdom still applies. Cut it too short and it doesn't develop the strong, healthy roots it needs to fend off weeds and disease. So find out the best height for the type of turf you're growing. Cool-season grasses, such as Kentucky bluegrass and red fescue, prefer to be between 3 to 4 inches high; while warm-season varieties like Bermuda grass can be maintained at 1 to 1 1/2 inches. Be sure to mow with a mulching attachment or a mulching reel mower and leave the clippings where they fall; they're a natural source of nitrogen as they decompose.
When it comes to conserving water, the good news is that organically-cared-for lawns require less warer than chemically treated ones, since the latter needs lots of moisture just to digest all the syntheic fertilizers and pesticides fed to them.
As with any lawn, the key is to water infrequently and deeply, encouragin turf to send down deep roots and making it less susceptible to drought and disease. The best time to water is early morning, since it gives your lawn plenty of time to absorb it and dry off in the sun. Most lawns require about 1 to 2 inches of water per week in summer. Use a rain gauge to measure how much water your lawn's getting; and make sure your sprinkler water isn't being wasted on your driveway or street.
With a little patience and a slight change in thinking, you'll be rewarded with a handsome lawn that's easier on the earth-and on your conscience. "The best thing is that I now have total peace of mind about my yard," says Libby Scancarello. "I want to put a little sign out front that says 'Chemical-free,' so my neighbors can see for themselves just how nice an organic lawn can be."
