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Yellow edges to leaves

This is a 8 month cutting, anyone know why the edges of the leaves are yellow? I'm guessing it's a mineral deficiency, like magnesium? And how can I fix it?
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Looks like either frost or water damage, so cultural rather than a deficiency I think. As the cutting gets going it should be fine and it will shed any damaged leaves but leave them on for now.
They are in a greenhouse so it's not frost, it could be too much water I suppose...Ok thanks
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.