Some fertilizer products contain preemergent or
postemergent herbicides for weed control, usually crabgrass prevention
or control of broadleaf weeds.
When
to use these products
-
Use only when the lawn has a known weed problem,
not every time you fertilize.
-
Apply when you have observed high numbers of
weeds and are sure treatment is necessary. With preemergent
products, this means relying upon weed populations observed
the previous year.
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Be sure the active ingredient in the
product is one that will control the weed species that
is causing your problems and also that the timing is
right.
- It is useless to apply preemergent herbicides after
target weeds have emerged.
-
Be aware that certain broadleaf herbicides,
such as dicamba (found in several weed-and-feed products)
and triclopyr can be absorbed by tree roots growing
in lawns and may injure trees if applied too close to
the tree drip line.
-
Precautions are always listed on the
herbicide label.
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