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Stumpy, you let your plants get too tall. The most growth that you should ever see is about 4", if that much. Only leaves must be showing, not vines. The part which forms the potatoes is not the vine but a special portion of the plant between the feeder roots and the aboveground growth. The plant must be tricked into not developing a stem but rather to keep extending the production zone. Once the stem is allowed to form, it doesn't matter if you have a stack of 20 tires as all you are doing is burying a non-producing stem.

Martin
 

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That was part of your problem you got great vine growth[ ?] and hardly any potatos. next time go easy on fertilizer. Same thing can happen to tomatos, lots of green vine no fruit.
 

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Too much nitrogen causes this, great vine and leaves, no potatoes. Next time use loop of 4 inch wire - you can reach in and take potatoes then put the material back for further production.
 
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