[QUOTE=Jackmannii]
By the way, “Preen” may rhyme with “green”, but it’s a pre-emergent herbicide that carries some environmental and personal risks with use.
Label warnings include moderate eye irritation and note the product is harmful if inhaled or absorbed through the skin. It also is listed as “extremely toxic” to fish and aquatic invertebrates (potential for harm through runoff into waterways). There are also reports of possible toxicity to frogs and toads.
A safe alternative is corn gluten meal (available at some garden and feed stores) which also inhibits sprouting of weed seedlings, and works as a fertilizer as well.
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One of the extremely few times I’ve puked in my life that weren’t alcohol or anesthetic related was after using a dandelion bar. I have a healthy respect for weed-killers now (and will probably look into the corn gluten meal). 