By Whitworthann
United Kingdom 
when do I know my potatoes are ready for cropping
2 May, 2010
Answers
windy is right .you could gently take some soil back and have a look.
2 May, 2010
As a rule of thumb in they are first early potatoes harvest about 8 weeks after planting but specifically after flowering. Main crop take longer 12 - 14 weeks but again should flower first.
2 May, 2010
Normally after they have flowered....the plant should start to die off ;)
2 May, 2010