SO true! They used to call them "Victory" gardens. I like to grow those small red potatoes sometimes called, "new" potatoes. You can throw them into soups, cut them and fries them up with some onions (yum), and don't even have to peel them, especially if you've grown them at home, and KNOW what has been around them. Potatoes should be a stalk garden plant, along with beans, corn, and greens. I actually grow curly dock that I took from a nearby field, and cultivated in a large pot with great dirt. We also collected cow paddies from a neighbor's field. That certainly helps with the fertilizer. Usually, when I harvest a potato plant, that's pretty much it. Just get some more potato "seeds" or allow your potatoes to grow "eyes," then cut as many pieces as possible that have them. Plant them about two week apart, so that you'll always have some growing. I think cow dung is the best for potatoes. Uh, regarding the cucumber, it's possible that you're right about it signaling the plant to grow more. I've named my LARGE cucumber plant FEED ME! I haven't even counted how many cucumbers I've gotten this year, but my fridge is full, I eat some every morning, and sometimes in the evening as well. All our friends and neighbors have also had a bag or two also... My husband likes to go out and check her to see if she's given anymore goodies!