We have 2 potato towers: one is planted with a yellow variety called "Mona Lisa", and the other is a purple variety called "Vitellotte". We planted them both at the same time, with 10 seed potatoes each (the boxes are roughly 60 cm to a side).
A couple of days ago, we harvested the Mona Lisa tower, since the tops of all but two plants were dried up. We were disappointed to find that no potatoes had been set in the upper layers of the tower. There were only potatoes in the bottom layer. The total harvest weighed 2.8 Kg, more potatoes than we've ever grown, but still way below the rumours of 50 lbs per tower we've gotten wind of. Why were there no potatoes in the upper layers? It's hard to say: we missed a lot of the potato tower action while travelling, and our knowledge of the life-cycle of potatoes is rather thin. It could be that the towers were raised too late, or at the wrong point in the plant's cycle.
Worried about the other tower, we took off some planks to check: there are no potatoes to be seen yet in the upper layers, but there are lots of roots, and the potato plants above are still very green and looking good (see photo). They even look like they are going to flower again. Since my understanding is that the plants set potatoes while they flower, it could be that the tower will fill up to the brim with potatoes then.
I wish I understood potatoes better. The two pieces of information I have about them that have helped are the simultaneous potato formation and flowering I mentioned, and the other is that potatoes are formed between the seed potato and the top of the soil (which is at the basis of potato tower theory). My knowledge of the habits of potatoes stops there, pretty much. Does anyone know where I can get some Potato 101 info, or have any potato wisdom to share? There are so many ways to plant potatoes! How do you do it?
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