I grew lady christie in 25ltr tubs this year,i noticed 1 plant looking a little yellow on the leaves so emptied it out to be honest i wasnt expecting anything much in the way of spuds as it was a weak looking thing and only had 2 stems.WOW i couldnt believe my eyes,enough spuds for me and the mrs for 2 meals,most a very good size double the size of a duck egg.Also a few marble size spuds that i cooked,drained added a knob of butter a teaspoon of mint and swished them round in the pan with the intention of having a snack whilst on the pc.Some chance i couldnt leave them alone
they never even got chance to cool down.
These spuds had been in the tubs for exactly 12 weeks,and i have planted several tubs and just doing a little experiment,all tubs are labled and have been grown in
compost only
compost plus growmore
compost plus blood fish and bone
leaf mould only
The tubs containing growmore and bfb both got fed at the same time and all of the tubs get watered together,so i should see which produces the better crop.Also on the go is spuds in tubs grown in soil also using the above methods.To bore you even further the tub i emptied was compost only.