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Changing the pH level of the soil can inhibit a plant's ability to absorb some nutrients, but tests have shown that leaves and pine needles can only create a very small change in the soil's pH when used as mulch or for winter protection. Whether or not these small changes will affect your plants depends a lot on your local climate conditions (how fast the leaves and pine needles decompose) and the pH of your existing soil.
If you use nothing but large amounts of leaves and pine needles over a period of several years, adding lime every few years will help counteract any acid buildup. Always let a soil test be your guide to making any adjustments. Fully composted leaves and pine needles are considered neutral and will not add to the acidity of your soil.
As a mulch. Because of their shape and rigidity, pine needles naturally lock together, which allows air and water to circulate while preventing the needles from packing down and forming a dense mat. This means your plants are far less likely to experience the rot and oxygen deprivation that sometimes occurs under thick layers of bark or leaves. The shape and rigidity of the needles also helps the mulch stay put during high winds and steady rains. Pine mulch can be used around vegetables and perennials of all kinds including roses and raspberries.
As winter protection. Add 3 to 5 inches of pine needle mulch to your garden beds in the fall. This will provide protection against sudden and extreme dips in temperature and allow plant roots to remain active until the ground freezes.
As a slug barrier. Create a ring of pine needles around the base of your hostas to help prevent slug damage. Pests like slugs and snails are known to avoid crawling over prickly objects that could injure or irritate their soft bodies.
As a walking path. Use pine needles to create walking paths between the rows in your vegetable garden. After you walk them a few times the needles pack down nicely. Not only do pine needles make an attractive path, but it will also help to keep the weeds from growing in-between your rows.
On your lawn. Run a mulching mower over them and let the leaves fall where they may. By chopping them up you'll be adding a thin layer of organic nutrients to your lawn, and you'll also save yourself some raking. If you don't have a mulching mower, simply raise the front wheels of your lawnmower by a notch or two and take several slow passes back and forth across your lawn. You can also put them in a tall plastic pail or garbage can and chop them up with your weed whacker.
To make leaf mold. Leaf mold is sometimes called garden gold and making it is simple. Collect leaves and drop them into a holding cage made from poultry wire wrapped around stakes pounded into the ground. If the leaves are dry when you collect them, wet them down with a hose. Now leave them there to decay. Next fall you can use your one-year-old leaf mold as a mulch, or allow it to decay for another year and use it to condition your soil.
As winter protection. Newly fallen leaves can be used as winter protection around plants, but need to be removed in spring to avoid smothering plants. Shredded leaves will decompose faster, but may also still need to be raked out in the spring. To prevent leaves from blowing away, cover them with pine branches.
About The Author: Ellen Brown is an environmental writer and photographer and the owner of Sustainable Media, an environmental media company that specializes in helping businesses and organizations promote eco-friendly products and services. Contact her on the web at http://www.sustainable-media.com
By
12/16/2009
I have used pine needles and leaves on my flower beds for several years. No ill effects noted, but do see it might be time to add some lime.
Thanks
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