Nature’s way of returning the nutrients back to the tree is through the leaves of the tree. Fallen leaves contain up to 80 percent of the nutrients that a tree absorbs during its growing season. Leaves return their store of nutrients to the soil when they are allowed to decay on the ground. The nutrients are reabsorbed by the tree’s roots and channeled back to a new season of growth.
It makes common sense to use this potent substance for your flower or/and vegetable garden. Leaves serve as a key component in your soil. You miss the opportunity to add a rich, natural source of organic matter to your garden if you don’t use the annual bounty of leaves. Regular applications of compost, mulch, and other matter, such as fallen leaves need to be mixed into your soil. Otherwise your soil becomes humus-deprived losing its ability to retain moisture and nutrients. The pH levels will drift out of balance making it less hospitable to microorganisms.
Fallen leaves are a favorite food of earthworms everywhere making it nature’s perfect mulch. Turn your soil into an earthworm factory with a thick layer of fallen leaves enriching it with one of the natural world’s finest-quality fertilizers—worm castings.
Large, leathery leaves such as oak can take years to break down. If left in thick layers, they become barriers between rainfalls and the soil, so shred these larger leaves. Leaf vacuums/shredders can reduce a mountain of leaves to one-sixth of its volume. Instead you can also shred leaves by mowing the lawn and raking the bulk into your flowerbeds or collecting them in bags to be used as summer mulch. Place a thin layer of shredded leaves in direct contact with the soil so that microorganisms can turn them into dark, fungi-rich leaf mold. Thin layers of shredded leaves will keep the ground cool, hold in moisture, and keep the weeds at bay. Shredded leaves make attractive winter mulch piled around garden plants after the ground freezes. This mulch provides protection for tender plant roots while allowing winter moisture to reach into the ground. You can also mix partially decomposed leaves into the soil to provide aeration while improving nutrient and moisture-holding capacity.
Over time, leaf humus tends to balance out soil that’s too acidic. The exception is large quantities of oak leaves, highly acidic themselves; so the opposite effect on your soil can happen. Apply leaves to your garden beds in the fall after plants are dormant. It is a good idea to also add a nitrogen source such as fish emulsion. Of course, do not use leaves from any diseased trees. They should be carried off your property actually to prevent the infection from spreading. Also avoid black-walnut leaves because they contain a toxin that can retard the growth of garden plants. The benefits from using fallen leaves far outweigh these few precautions.
