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to garden is to encourage some plants and discourage others.
will start with crabgrass in lawns:
With proper cultural and environmental conditions
lawn grass can co-exist and out compete crabgrass
Crab grass thrives (and out competes) especially in hot dry areas (full
sun all day).
To restrain the crabgrass there are several options. In small areas
hand weeding is not as formidable as it might seem. If the soil is
somewhat moist it pulls up easily. It's more of a struggle if the soil
In larger areas the choice is between two types of pre-emergent
applications. Both the chemical and the organic choices are equally
effective. the choice is environmental sensitivity and cost - the
organic choice is more expensive. Both approaches are quite time and
weather sensitive and need multiple seasons of applications.
I have used corn gluten on
lawns in the past 10 years or so with good success reducing
the amount of crab grass. the seed can lay dormant for several years
and also continue to germinate till mid august so with either type of
application some plants will continue to spout.
My first test was a front lawn in full sun (full of crab grass). I
applied con gluten on half. There was a dramatic difference in the
amount of crab grass that appeared (80% control) on the test section.
So I did both sections the following year with similar reductions. Did
no hand weeding.
interesting article on the benefit of some "weeds:
will add other "weeds" in future (maybe)