:)hiya m8, you shouldnt loose too many (tattys green) due to not earthing up, depending on how deep they were planted /rightly mentioned by another member, however tattys grow the same as tomatoes(up the stalk) and not down at the roots so it is realy better to hearth up not only to prevent green spuds but also to protect against frost(which hopefully have gone by now) and also to give the plant some medium to harvest well, hope this helps cheers Andy