I was gathering seeds from my plants this weekend (good year so far). However about 10% of these plants had a white powdery substance on the stalk leading to the seeds (and on some seeds). Should I worry or is this normal?
I have had the same thing. I have noticed this over the years and it is no big deal in my opinion. If it gets really thick and builds up on the seed stems I will sometimes wipe it off with my fingers. Not sure, but I think it might be powdery mildew.
I've seen some of this this year, as well, and agree that it is probably powdery mildew from all the rain. Here it is, August, and I'm still having to mow my grass!
My seeds were looking great, until the squirrels or something started taking the entire seed stalk and berries! Dang tree rats! I guess that is what was doing it. Might have been rabbits, too. At least I harvest some seed from my seed patches, but only about 1/4 of what I should have gotten.