Posted: 27/06/2013 at 19:31
Depends when you planted the spuds out but Charlotte, I think are 1st earlies.
1st earlies are ready for harvest 10 wks after planting out. 2nd earlies 13wks and maincrop 15 to 20wks. It's not an exact science though, if you planted out early and the spuds were hit with a frost this could slow their growth down, by up to 2wks.
Spuds are ready when they have flowered and the foliage starts to die back. Harvesting earlier means the spuds are likely to be smaller and harvesting later a little bigger.
2nd earlies skins will harden if left in the ground making them better to store although maincrop are the one's usually grown for storage over winter.