My comment stands. Roundup would not be a problem at all for what you
describe. Complete non-issue as far as safety for spraying all over
Unlike vinegar, roundup kills the roots or the weeds, so they don't
come back, or spread. Vinegar doesn't kill the whole plant and root
system. It just damages the existing foliage. If the roots aren't
killed, the foliage will grow back quickly.
Same problem. Mine has an 18 inch bed of gravel topped by a 6 inch
bed of limestone screening topped by the pavers and pavers are tightly
butted. Weed seed still gets in there. I want to "flood" the whole
patio rather than just spray the joints so I can get killer down, but
dont want chemical hebicide imbeded into bricks. Spraying the joints
literally takes all day, I want to flood whole patio with a non-toxic
herbicide and watering can maybe once a month.
Completely impractical unless you want to use something that will make
the ground more or less permanently unfriendly to plantlife. See also
: Sodium chlorate mixed with Atrazine
This (below) would be a much better solution for you if you want to
avoid using very nasty chemicals:
I use this torch, connected to a propane tank from my gas grill to
keep the flagstone around my hot tub weed free. It's fast.
If it is non-toxic-- then how will it help anything? All the major
players have minimally toxic, with short 'toxic to animals' phases.
One hour- once a year- and be done with it.
It doesn't matter if your gravel base is 100 feet deep-- the weed
seeds come from the top.
There is no need to flood the entire patio using Roundup...just spray
the weeds according to instructions. One use should kill all the weeds,
although tough waxy leaves may require two applications. Then, spot
treat any new weeds (or pull by hand). Existing weed seeds may continue
to germinate for a while, but once gone the patio should be easy to
maintain. If there are lawn grasses adjoining the patio and growing
between pavers, a barrier should help keep them out.
Yes there is a good reason to flood it, there are probably 500 brick
joints in both directions spaced 3 to 7 inches apart on a 40 foot by
20 foot area. Spraying the full length of those tens of thousands of
joints takes literally days, if I spot spray then I'm waiting for the
weeds to win the fight and show themselves. I could flood the patio
in a 10 minute job, rather than, literally a 10 hour job of spraying
each brick joint, then having the outer edges of every brick
discolored by roundup oil and middle of each brick still dry. I'd
rather every brick soak up a harmless non-oily sunbstance for
consistent color and get the joints well flooded deep with killer all
done in 10 minutes.
Oil? Never have seen oily residue using Roundup. Your idea of flooding
is not the same as mine, apparently. When you mentioned flooding, I
pictured saturating the whole patio with R. Spraying the entire patio
to cover all of the weeds should not take long. The entire weed does
not need to be wetted...Roundup is taken up by the plant through the
foliage and, providing one follows label instr., begins very soon to
kill the plant. Remaining Roundup decomposes, IRRC, in about two weeks.
It should be applied when one expects no rain for a couple of days.
There are a few weeds with tough, waxy foliage, that are a little
tougher to kill. Any foliage killer will probably leave behind
unsprouted seeds, but the next crop should be much smaller and once
eliminated should be very easy to keep clear. I avoid widespread use of
poison, and combine good maintenance into the plan. Pulling one weed by
hand before it produces seed might eliminate hundreds or thousands of
plants. Gotta keep the R. away from desireable plants. I know nothing
about the salt/vinegar treatment, but there are good plants that are
very sensitive to salt, like rhododendron and azalea, so it isn't
necessarily the best method for all weed problems.
An ATV with a small mounted sprayer could apply Roundup in less than
five minutes in that small an area. Roundup drifts in wind...you have
to be careful. Safer by far than the pre-emergent sprays and with no
residue problem. There are also wide spongemop type applicators that
you just drag/wipe over the patio.
On Wed, 29 Sep 2010 13:22:37 -0400, " firstname.lastname@example.org"
green NOW. What you want is a soil sterilizer - which is, by
definition, poisonous (at least to plants) and long-lasting. It will
prevent new seeds from germinating.
Corn Gluten is supposed to stop weeds from sprouting.
Calmix from NuFarm is a common sterilizer -Bromacil and 2-4d.
Methyl Bromide is no longer readily available, but worked.
Anything with Prometon is also non-selective and residual.
Pramitol and Sahara DG are other brands.
Do NOT get it anywhere you want vegetation to grow within a year or 2.
DO NOT over-apply - as it can leach or wash out to areas where
vegetation is desired -
You need a two-step process:
1. Kill the existing weeds. Roundup, vinegar, propane torch, pull 'em by
2. A liberal application of a pre-emergent herbicide to kill the weeds,
spores, seeds, cuttings, tubers, and all the plant eggs remaining. You
should use this herbicide every spring and it usually lasts the whole
There is no visible dirt, the weeds are between the brick joints. I
suppose I could add just a little round up to the vinegar and maybe it
wont oil-into the brick so bad. But I do need to flood the surface,
there is no way in hell I'm gonna individually spray all those joints
and have just the brick edges get stained. I'd rather flood then
sweep it around until it drops between the tight paver joints, then
hose it all down next day to wash the brick surface.
Maybe in the desert- but in my part of the world that will only work
for a year. Weed seeds are smaller than the gap between pavers- and
will sprout as soon as there is enough moisture there to set things in
The OP has set so many parameters and objections, that I don't think
his problem can be solved to his satisfaction.
If he doesn't like the weeds, and also doesn't like any of the
effective methods for controlling them, then maybe he can't have
bricks, and needs to start over with something completely different.
Perhaps a poured concrete slab capped with tile of some type, with
grout between them. Maybe Mexican terracotta if he likes the color of
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