When do you harvest your potatoes? I am struggling to determine the time that I should harvest. My potatoes are just about done flowering.
Once flowering stops, the vines will start pumping all their energy into producing potatoes underground. When the vines brown and die back, they're spent and you can dig potatoes. How long this period between flowering and vines dying back lasts depends on lots of factors, not the least of which is weather and watering.
I recommend cutting off watering when you start to notice the vines deteriorating (the first signs of yellowing/browning, the vine will usually slowly die back for another week or so). This will harden the skins of the potatoes a little more to improve storage. So you also want to dig when there hasn't been rain for a week+ if possible.
If the weather is warm and the soil moist at the end of the cycle, the potatoes will sprout in-ground and this is obviously very bad for your harvest and to be avoided.
So basically the trick is to try and have your vines die back when the weather has started to cool a bit and is expected to be dry, but if they die back early the potatoes can be fine in the ground, to be dug later, as long as it's dry. If they die back early and you can't keep them dry, dig them immediately.