Potato leaf problem

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I am growing Rocket early pots in a potato barrel. The leaves have been covered as they grew in the normal method. The leaves are now at the top of the barrel and I am letting them grow on. Problem is that the leaves look a bit poorly. Bobbly and a little curly is the only way to describe them. Is this a symptom of a problem or do they always look like that (I haven't grown Rocket before) The later salad pots in the bags next to them look fine. Grateful for advice.

MD

 

Thanks, now they are more exposed they are beginning to look more normal so I'll give it a bit.

Thanks again