How do you kill weeds in cement cracks?

[ralph]

[trader_4]

Lack of any cites to any actual studies so that the science can be traced and evaluated noted. I could do the same thing with almost any chemical, food additive, etc that's in widespread use.

[ItsJoanNotJoann]

Yep, as I stated, when I use Roundup (long term product) I have no weeds until the next year. My fault for not being clear.

[clare]

Well, 3 days is WELL within 10 --- When a brand name for a product gets extended to other products for marketting purposes, things get screwed up. Think "wd 40" and "wd 40 professional" or "wd40 Specialist" products.

Same thing with "roundup" Roundup is almost a generic term for glysophate weed killer - then they put the "roundup" name on half a dozen other weed control products - some of which may contain no glysophate at all. (generally not "weed killer" products, but "weed control" products. We need to specify exactly what we are talking about when using "Brand names".

Glysophate based weed killers have a short half life and minimal carryover. They work by leaf absorption - not root contact - and they do not prevent seasonal regrowth. Their "burnoff" only kills actively growing vegetation and has little or no effect on seeds.

[trader_4]

Agree, when you just say roundup, it's implied that it's the glyphosate product or one of the generics.