Last autumn I transplanted three, relatively young redcurrants which I had received from a neighbor because they had not prospered in her garden. One of them is now starting to grow green leaves (hurray!) but the other two still look barren. It is early in the season (zone 6 in Central Europe) and I won’t give up to them anytime soon, but I am wondering whether I could do anything special (e.g. in terms of fertilization or pruning) to increase their chances of survival in the new habitat.
Up to now I have been loosening the ground (this spring) and cutting back all but approx. 5 branches on each bush (last autumn). I am somewhat tempted to cut into single branches to check also insides but imagine that this will do more harm than good at a time when natural growth could occur. Is there any better strategy than just "wait and see"?