Green Newton

Fall is the best time to start transitioning lawns to organic. The key to a healthy lawn is healthy soil and good mowing, watering, and fertilizing practices. Healthy soil contains high organic content and is teeming with biological life. Healthy soil supports the development of healthy grass that is naturally resistant to weeds and pests. In a healthy, fertile and well-maintained lawn, diseases and pest problems are rare.

Lawns that are currently chemically-dependent may require more resources to restore biological life. But in the long-term, an organic lawn uses fewer materials, such as water and fertilizers, and requires less labor for mowing and maintenance. More importantly, organic lawns will be safe for children, pets, and the local drinking water supply. Our treatment of lawns and landscapes is directly related to the health of our environment!

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Mow High Until the Season Ends – Bad mowing practices cause more problems than any other cultural practice. Mowing with a dull blade makes the turf susceptible to disease and mowing too close invites sunlight in for weeds to take hold.

Keep your blades sharp or ask your service provider to sharpen their blades frequently. For the last and first mowing, mow down to 2 inches to prevent fungal problems. For the rest of the year, keep it at 3-3.5 inches to shade out weeds and foster deep, drought-resistant roots.

Aerate – Compaction is an invitation for weeds. If a lawn is hard, compacted, and full of weeds or bare spots, aerate to help air, water, and fertilizer to enter. If you cannot stick a screwdriver easily into the soil, it is too compacted. Getting an aerator on the turf will be especially helpful. Once you have an established, healthy lawn, worms and birds pecking at your soil will aerate it for free!

Fertilize, but go easy! – Fertilizing in early fall ensures good growth and root development for your grass. Nitrogen, the most abundant nutrient in lawn fertilizers promotes color and growth. Adding too much nitrogen, or quick release synthetic fertilizers (which are not part of an organic program), will result in quicker growth and the need for more mowing. Too much nitrogen can also weaken the grass, alter the pH, and promote disease, insect, and thatch build-up. If applied too late, nutrients can leach directly into nearby surface waters. Be aware of local phosphorus or nitrogen loading concerns.

Grass clippings contain 58% of the nitrogen added from fertilizers, improve soil conditions, suppress disease, and reduce thatch and crabgrass. So, leave the clippings on the lawn. A mulching mower to leave the leaves on the lawn too – a great alternative to raking.

Compost is an ideal soil amendment, adding the much-needed organic content to the soil and suppressing many turf pathogens. In the fall and spring, preferably after aerating, spread ¼ inch layer of compost over your lawn. Compost tea and worm castings are also great additions.

Analyzing soil is highly recommended to determine specific soil needs. Contact the university extension service to find out how to take and send in a soil sample. In addition to nutrients and pH, ask for organic content analysis, and request organic care recommendations. Ideal pH should be between 6.5-7.0, and organic content should be 5% or higher. Soil test results will ensure that only the materials that are needed are applied.

Overseed With the Right Grass Seed – Once again, fall is the best time to seed a lawn. Grass varieties differ enormously in their resistance to certain pests, tolerance to climatic conditions, growth habit and appearance. Endophytic grass seed provides natural protection against some insects and fungal disease – major benefits for managing a lawn organically. The local nursery will know the best seed for the area. Check to see the weed content of the grass seed and that there are no pesticide coatings.

Develop Your Tolerance – Many plants that are considered weeds in a lawn have beneficial qualities. Learn to read your “weeds” for what they indicate about your soil conditions. Monocrops do not grow in nature and diversity is a good thing.

For instance, clover (considered a typical weed) is found in soil with low nitrogen levels, compaction issues, and drought stress – conditions that can be alleviated with the above recommendations. However, clover is a beneficial plant that takes free nitrogen from the atmosphere and distributes it to the grass, which helps it grow. Clover roots are extensive and extremely drought resistant, providing significant resources to soil organisms, and staying green long after turf goes naturally dormant.

Learn more about lawn and landscapes at Beyond Pesticides website, including how to become an advocate for organic parks.

If you are looking for lawn care services that offer a pesticide free approach, check out our listing of recommended lawn care providers.