The longer you leave them alone after the flowers die, the bigger the potatoes get. When your potatoes get close to flowering is the come get me, I’m ready for the table signal. Yes, you can actually grow potatoes from last year's crop. Tubers are formed during the budding of potatoes. You can rob your new potatoes anytime after they have reached usable size, 50-60 days after planting for early varieties. Can you dig up potatoes before they flower? Wait for them to flower. Here are some you might face. With earlies, wait until the flowers open or the buds drop; the tubers are ready to harvest when they are the size of hens’ eggs. Let the vines die all the way back before you harvest them. Potatoes need to stay in the ground until flowering has finished (or longer) in order to be large enough to use. My trick is to scrabble around the roots, pulling soil away until I can see if there are any tubers in there which are big enough to eat. First, early harvests, called “new potatoes,” can be made anytime after the plants begin to produce flowers. The short answer is no, you cannot dig potatoes before they have flowered. The period when you can dig up young tubers depends on the region, variety and technology of planting potatoes. Clean your potatoes before … If you want to harvest all of your new potatoes at the same time, try to time your harvest when most of the potato plants have started to flower. After the purplish flowers die, you can start digging for baby potatoes. This is prime time for harvesting tender new potatoes.. Just dig before the ground completely freezes. If there are just one or two, then I go along the whole row until I have enough for a meal. If you left some tubers in the ground over the winter after last year's harvest, however, don't use these as seed potatoes. To toughen up your potatoes for storage before harvest, do not water them much after they flower. Potatoes can be a trouble-free crop if you follow a few simple practices, though they’re not immune to typical garden problems. Though you can harvest many main-crop potatoes as earlies, or carefully dig a few out after the plant has flowered, I think it’s best to grow types specifically bred to be earlies. When the potato plant flowers, it has generally reached maturity.. They’ll crop earlier and be bred for flavor and texture as an early. The potatoes will begin to plump up at this point, growing until the plant starts to die back. It's not usually worth digging potatoes until they flower, but they will continue to bulk up after that time. When you see that the first flower has bloomed in the potato plant, be ready to harvest the sweet new potatoes.Instead of digging out the entire plant, carefully move aside the soil around the roots. 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