October
2005
By
B. Rosie Lerner
Extension Consumer Horticulturist
Purdue University
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Fall Leaves: Litter or Loam?
The hot dry weather experienced throughout much of Indiana is bringing
an early leaf drop to many landscape plants. While there is potential
for a rainbow of colors, the stressful conditions may make for a less-than-awesome
display. For some homeowners, the annual show is overshadowed by chores
of leaf raking and disposal.
What's needed here is an attitude adjustment! Autumn leaves don't have
to become trash. On the contrary, they easily can be turned into valuable
soil-enhancing organic matter that helps turn poor soil into loam.
Green-thumbed gardeners have long known the value of recycling plant material.
Dry leaves can be plowed or tilled under in the vegetable or annual flowerbed
to provide a source of organic matter. Shredding the leaves first will
speed the breakdown so that the leaves will not be visible by spring.
Be sure to mix the leaves into the soil, rather than leaving them on top
through the winter. This helps prevent the soil from being too cold and
wet to work in the spring.
Tree leaves can be recycled directly on the lawn. Use your power mower
or shredder/vacuum to break dry leaves up into smaller pieces. A mulching
blade on the mower will speed this process, but even a standard blade
will do an adequate job. For large leaves like maple and sycamore, it
may take several passes to get a finely shredded product. Once the leaves
are pulverized, they will break down quickly. A fall application of nitrogen
fertilizer (about 1 pound of nitrogen per 1,000 square feet) will help
speed decomposition of the leaves and also will benefit the grass plants.
Fall leaves also make great composting ingredients, especially when mixed
with green trimmings and grass clippings. Again, the smaller the pieces,
the faster they'll break down, so shred or chop dry leaves before adding
them to the compost pile. If you don't have green trimmings or grass clippings,
add a source of nitrogen to dry leaves, such as commercial fertilizer
or composted cow, horse, sheep, or poultry manure. Microorganisms need
nitrogen as they break down the carbon in plant materials. Add a sprinkling
of soil or finished compost to introduce a source of the microorganisms,
and water just enough to moisten. The compost will heat up in the center
as it breaks down. Stir the contents occasionally to add air and allow
for uniform heating. Generally, the more often you turn the pile, the
faster you'll get a finished product. Compost is ready to add back into
the garden when it looks uniformly dark and crumbly.
Last, but not least, shredded leaves can be used as a winter mulch to
protect tender perennials through the coming harsh weather. Shredding
the leaves will help prevent them from packing down as they get wet and
smothering the plants that they are supposed to protect. To provide winter
protection, apply a 3-6 inch layer of shredded leaves over the top of
tender perennials after several hard freezes. The goal of winter mulch
is to keep plants dormant through the winter, so it must be applied after
the ground is cold and plants are fully dormant. The timing of application
will vary from year to year with the weather, but generally will be appropriate
sometime between the Thanksgiving and Christmas holidays.
9-15-05
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