By Bungalow0211
United Kingdom 
My potatoes are being grown in 20" containers but have now reached some 18 to 20" above the rim of the container what is causing this to occur
2 Jun, 2014
Answers
Thank you for your reply. I planted them approx. third awy up from base
3 Jun, 2014
Are they in the sun or in shade? If they are in shade the tops are growing up looking for the light.
3 Jun, 2014
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How deeply did you plant the tubers in the container? It is perfectly natural for the foliage to grow up to 18 inches, i the ground you simply keep ridging them up until you can't ridge anymore.
3 Jun, 2014