Your may begin to harvest your potatoes 2 to 3-weeks after the plants have finished flowering. At this time you will only find small "baby" potatoes if you were to dig up a plant. Potatoes can be harvested any time after this, by gently loosening the soil, reaching under the plant, and removing...
on the back of most seed packets it should tell you. you should be able to peek in on the corn and see if it has filled out yet. What kind of onion? and I haven't had any experiences with the others
for those of you that buy seeds online, what site do you recommend? I'm thinking I'll order from burgess but they don't sell celery. I can get that out town though.