seed saving- how to keep bugs out of seed.

so, i saved a bunch of hollyhock pods. of course they were full of weevils. i soaked the seeds in a cup of water, and they all came crawling out. or i hope all. when i spread the seeds out on paper towel, i picked off a couple dead ones, and they seem to be clean now.

also have a bunch of sunflower seed. last time i saved sunflowers i opened the cigar box in the spring, and they had all been eaten by some little moth, i think.

also lost a box of pumpkin seeds, tho it didnt happen until they were about 3 years old.

so, anyone have good tips for preventing insect infestations in their seed?