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.
Certified GKH Gardening Expert
There is much debate on how long herbicide residue lasts in our ground.
Here is a link that has a great overview.