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Add 1 Tablespoon of Hand Soap per gallon for best results...
on August 18, 2012
For some reason this herbicide doesn't "wet" to the crabgrass well - the droplets of spray bead up and the crabgrass doesn't absorb it well. In contrast, one drop of Roundup (which kills everything) will spread over an entire leaf amazingly well. Through trial and error I have found that adding one full tablespoon of hand soap per gallon dramatically improves wetting and thus absorption by the weed - a teaspoon of soap isn't quite enough. With most weeds - especially crabgrass - expect to have to reapply herbicide every other day at least three times to finally kill it, otherwise the crabgrass gets 'sick' but recovers in a few days.
Onion Grass Advice: If you want to kill that tall Onion grass that appears at random in your yard, buy a cheap set of stainless steel BBQ tongs and two of the small 1" diameter x 3" long replacement paint rollers. Duct tape or bolt the rollers on the ends of the tongs so that they touch each other. Wait until a couple of days before you mow, when the Onion grass is much taller than the regular grass. Then holding the tongs over a sidewallk or driveway (not grass!!) spray Roundup on the rollers (but not to the point it drips). Walk over to the Onion grass and grab them with the rollers and wipe them lightly once, coating the upper few inches with herbicide. You can do about 10-15 weeds before re-saturating the rollers with roundup. It only takes one application to kill them. Be careful not to drip on nearby grass, Roundup kills everything.