Canada thistle herbicide
Will a Canada thistle herbicide be taken up by food/root vegetable plants (and thus be eaten)? My new home was heavily sprayed last fall professionally for Canadian thistle. The first sweet potato plants I put in this year died but their replacements look fine. I also planted squash, asparagus, raspberry and rhubarb. I'm concerned about residue in my crop.
There is much debate on how long herbicide residue lasts in our ground.
Here is a link that has a great overview.