Yes, you can actually grow potatoes from last year's crop. It's not usually worth digging potatoes until they flower, but they will continue to bulk up after that time. Let the vines die all the way back before you harvest them. If you left some tubers in the ground over the winter after last year's harvest, however, don't use these as seed potatoes. If you leave them until fall and the leaves die, you will have the largest potatoes. New Potatoes. This is prime time for harvesting tender new potatoes.. Insect Pests: To protect growing plants from foliage-munching Colorado potato beetles and flea beetles, cover the … They’ll crop earlier and be bred for flavor and texture as an early. 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. Potatoes need to stay in the ground until flowering has finished (or longer) in order to be large enough to use. Here are some you might face. 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. Just dig before the ground completely freezes. When the potato plant flowers, it has generally reached maturity.. To toughen up your potatoes for storage before harvest, do not water them much after they flower. 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. After the purplish flowers die, you can start digging for baby potatoes. Potatoes can be a trouble-free crop if you follow a few simple practices, though they’re not immune to typical garden problems. You can rob your new potatoes anytime after they have reached usable size, 50-60 days after planting for early varieties. Wait for them to flower. 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. The period when you can dig up young tubers depends on the region, variety and technology of planting potatoes. Tubers are formed during the budding of potatoes. The short answer is no, you cannot dig potatoes before they have flowered. The longer you leave them alone after the flowers die, the bigger the potatoes get. The potatoes will begin to plump up at this point, growing until the plant starts to die back. First, early harvests, called “new potatoes,” can be made anytime after the plants begin to produce flowers. Clean your potatoes before … First early potatoes should be ready to lift in June and July, second earlies in July and August, maincrops from late August through to October. 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