re: honest question…why do so many of you soak your yard with chemicals?

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I got 3 downvotes because pre ems travel 1/2 inch into the soil an settle there. They do not wash off, they do not travel downstream, the thunderstorm that came 30 minutes after application did kill any fish.

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I'm sure most of it doesn't wash off in most rain scenarios. But to say none of it washes into drainage areas is dumb. The granules that were over broadcast on to concrete areas are going to get washed away. If an unusually hard rain comes following a dry spell some of it can wash away before it soaks in the ground. And no one said anything about the chemical runoff being so acute that its "killing fish".

Its a small risk that probably doesn't amount to a hill of beans. But it was a small risk that was taken in the name of eliminating some weeds for a few months.