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in Fruit & veg
Wait till they have finished flowering.
Hi, my potatoes didnt flower at all last year, so I pulled mine and the potatoes were actually quite good. Charlotte potatoes.
I've had years when they didn't flower. I don't know if it depends on the variety. I usually pull mine up about 12 weeks after planting. As I plant them out around Easter I start harvesting around July/August. If you're growing them in a tub you can always put your hand in and test to see if they're big enough. Never grown them in a greenhouse though so I don't know if this would speed up their maturity
You don't say what type they are so I'm guessing first early. If they are flowering leave them till they have finished. However, a gentle exploration careful not to break roots may be worth it . I would not have thought a greenhouse would make much difference but water will, not enough small potatoes too much and they can rot. If the tops are healthy and still growing they should be OK.
For the past couple of years we have planted salad potatos in bags, they have never flowered but the potatos have been an utter delight. We wait until the green tops start to bow over then we dig up.