Wisteria problem

Hi Purcellr sounds like nutrient deficiency magnesium / nitrogen which as should be putting on plenty of leaf growth now , probably indicates pot supply exhausted.As it nearly time for summer prune I would trim back new wispy growth to about a foot in length plant out if poss. or re -pot and feed with liquid tomato feed.

Best get it out of the pot - don't forget to prune it to three buds after flowering or you could lose this 'youngster' during the winter.

On a positive note, my neighbour has a wisteria growing in a pot - been there several years and flowers every year. It's a Very large pot, tho - about the biggest you can buy.