Herbicides

[ironhat]

Do herbicides (non-selective vegetation killers) lose their potency after a couple of years? I don't recall this to have been the case but times and products do change.

[Black wallnut]

IIRC they do have a shelf life. Although if unopened and kept away from temperature extremes they'll last for years.

[ironhat]

Thanks, Mark. IIRC () these are more than a "couple" of years old.

[tommyt654]

Yes to some degree degredation occurs over their life span and BW,S right about temp changes, especially cold, you should never let it freeze.

[crybdr]

They last longer than the label says based upon experience. However, efficacy probably diminishes over time.

I emptied some leftover Round-Up (mixed from concentrate last year and sat in the sprayer over the winter) this summer on a garden bed that I intend to turn back to grass. It shouldn't have been enough - even if it was fresh. But, all of the overgrowth is nice and brown. This stuff frankly scares me a little but I'm careful when I work with it.

[Knottscott]

Try a little test spot in a neighbor's yard, and let us know how it goes.

[radhak]

Murphy's law dictates that if you wanted to use it for the weeds in the garden, it will prove ineffective; but if some person had ingested it, s/he will need emergency attention .