18 Feb 2008 03:58:07 | Michael J. McGroarty
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Keeping your landscape plantings, flower beds, and nursery
crops free of weeds is a battle, but if you approach it with a
strategic plan, you will prevail. In order to develop a plan,
you first must understand how weeds work, and what kind of weeds
you are dealing with.
Basically weeds grow either from seed, or they reproduce from
their roots. As the roots grow outward from the parent plant,
new plants sprout up from the lateral roots, creating more
parent plants and the process continues and the weeds thrive.
Weeds that tend to reproduce from the root are usually more
difficult to control.
Weed control facts? Weeds are plants, and they function just
like the desirable plants in your yard. They need water,
sunlight, and nutrition to survive. Of these three key survival
needs, the easiest one for a gardener to eliminate is sunlight.
Through proper mulching you can eliminate the sunlight.
But first, let’s look at the steps you should go through
before you mulch, then we’ll discuss the best mulching
techniques to use. In order for your weed control efforts to be
truly effective, you should do everything in your power to make
your gardens as weed free as possible before you plant or mulch.
There are a couple of ways you can go about this, either
organically or with chemicals. I don’t like using chemicals, but
I do use them for weed control, and I use them for pest control
when necessary.
I’ll discuss organic control first. The first thing you should
do is remove all unwanted vegetation from your planting area.
Using a hoe, spade or other digging device, undercut the roots
and remove the undesirable plants, roots and all. Then you
should work the soil by rototilling or turning the soil by hand.
Once worked, let the soil sit for four days or so, and work it
again. Keep doing this over and over as long as time permits.
This process serves two purposes. It brings the roots that were
left in the soil close to the surface so they can be dried by
the sun, which will make them non-viable, and it disturbs the
weed seeds that have started to germinate, which makes them
non-viable as well. The longer you continue this process the
more weeds you are eliminating from your garden.
Weed control facts? Depending on the time of the year, there
are a few billion weed seeds drifting through the air at any
given time, so to think that you can eventually rid a garden of
weed seed is false thinking, but at least this process is
effective for the remaining roots, which are the most difficult
to control.
With that process complete, go ahead and plant your garden.
When you’re done planting you can either mulch the bed, or keep
turning the soil on a weekly basis to keep it free of weeds.
Most people opt to mulch. Not only does mulch help to control
the weeds, but if you select a natural mulch it also adds
organic matter to the soil which makes for better gardening
results down the road.
Before mulching you can spread newspaper (7-9 layers thick)
over the soil and place the mulch over top of that. The
newspaper will block the sunlight from reaching the surface of
the soil and help to keep weed growth to a minimum. The
newspaper will eventually decompose, and not permanently alter
the make up of your garden. Paper grocery bags also work well,
so the next time you hear, “Paper or Plastic?”, you’ll know how
to answer.
What about black plastic, or the weed barrier fabric sold at
garden centers? I don’t like either and I’ll tell you why. For
one, neither one of them ever go away, and the make up of your
garden is forever altered until you physically remove them,
which is a real pain in the butt.
Weed control facts? Plastic is no good for the soil because
soil needs to breath. Plastic blocks the transfer of water and
oxygen, and eventually your soil will suffer, as will your
garden. It’s all right to use plastic in a vegetable garden as
long as you remove it at the end of the season and give the soil
a chance to breath.
Weed barrier fabrics allow the soil to breath, but what
happens is that when you mulch over top of the fabric, which you
should because the fabric is ugly, the mulch decomposes and
becomes topsoil. Weeds love topsoil, and they will grow like
crazy in it. Only problem is, they are growing on top of the
fabric, and you are stuck with a ton of problems, like a weedy
garden, and a major job of trying to remove the fabric that is
now firmly anchored in place because the weeds have rooted
through it.
Weed fabric is also porous enough that if an area becomes
exposed to the sunlight, enough light will peek through and
weeds below the fabric will grow, pushing their way through the
fabric. I don’t like the stuff. I’ve removed miles of it from
landscapes for other people because it did not work as they had
expected.
Weed control facts? Controlling weeds with chemicals is
fairly easy, and very effective if done properly. I know that
many people don’t approve of chemical weed controls, but
millions of people use them, so I might as well tell you how to
get the most effect using them.
There are two types of chemical weed controls, post-emergent,
and pre-emergent. In a nutshell, a post-emergent herbicide kills
weeds that are actively growing. A pre-emergent prevents weed
seeds from germinating. Of the post- emergent herbicides there
are both selective and non-selective herbicides. A selective
herbicide is like the herbicides that are in weed-and-feed type
lawn fertilizers. The herbicide will kill broad leaf weeds in
your lawn, but it doesn’t harm the grass.
One of the most popular non-selective herbicides is Round-up®,
it pretty much kills any plant it touches. Rule number one. Read
the labels and follow the safety precautions!!! Round-up® is
very effective if used properly, but first you must understand
how it works.
Round-up® must be sprayed on the foliage of the plant, where
it is absorbed, then translocated to the root system where it
then kills the plant. It takes about 72 hours for the
translocation process to completely take place, so you don’t
want to disturb the plant at all for at least 72 hours after it
has been sprayed.
After 72 hours you can dig, chop, rototill, and pretty much do
as you please because the herbicide has been translocated
throughout the plant. The manufacture claims that Round-up® does
not have any residual effect, which means that you can safely
plant in an area where Round-up® has been used. However, I would
not use it in a vegetable garden without researching further.
No residual effect also means that Round-up® has no effect
whatsoever on weed seeds, so there is absolutely no benefit to
spraying the soil. Only spray the foliage of the weeds you want
to kill. Be careful of over spray drifting to your desirable
plants. To prevent spray drift I adjust the nozzle of my sprayer
so that the spray droplets are larger and heavier, and less
likely to be carried by the wind. I also keep the pressure in
the tank lower by only pumping the tank a minimum number of
strokes. Just enough to deliver the spray. Buy a sprayer that
you can use as a dedicated sprayer for Round-up® only. Never use
a sprayer that you have used for herbicides for any other
purpose. Once you have sprayed the weeds, waited 72 hours and
then removed them, you can go ahead and plant. Mulching is
recommended as described above. To keep weed seeds from
germinating you can apply a pre-emergent herbicide.
Depending on the brand, some of them are applied over top of
the mulch, and some are applied to the soil before the mulch is
applied. A pre-emergent herbicide creates a vapor barrier at the
soil level that stops weed seed germination, and can be very
effective at keeping your gardens weed free. They usually only
last about 5 or 6 months and need to be re-applied.
Visit a full service garden center and seek the advice of a
qualified professional to select the pre-emergent herbicide that
will best meet your needs. Never use a pre-emergent herbicide in
your vegetable garden, and be careful around areas where you
intend to sow grass seed. If you spill a little in an area where
you intend to plant grass, the grass will not grow. They really
do work.
That’s what I know about weed control. Read this article
several times. Your success depends on getting the sequence of
events correct.
Michael J. McGroarty is the author of this article. Visit his
most interesting website, http://www.freeplants.com and sign up
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About Author :
Michael J. McGroarty has more than 30 years experience in the
landscape gardening/nursery industry. He's spent the better part
of his life on his hands and knees in the dirt working with
plants and his hands-on experience allows Mike to write in a
manner than many gardeners find to be helpful and beneficial.