Cherry tree not growing
Earlier this year In January I bought and planted a Stella Cherry on gizella rootstock tree from my local garden centre. At about the expected time some of the buds started opening. Although only two buds produced any blossom. Some of the remaining buds started producing leaves, but then everything stopped. No more buds opened and the leaves that did start to grow have stayed the same size for the last 4 weeks. It doesn't look dead but it's growth seems to be frozen. tIt's in a relatively sunny south east facing corner, I've watered it regularly since mid March ish, and because my garden is tiny, am growing it in the largest pot the garden centre sold in a mixture of no. 3 and tree and shrub compost. I'm hoping this is temporarily and as a result of the extreme cold weather in April but look for thoughts on whether it might or might not recover. I've attached a picture which shows what the tree has looked like for the past 4 weeks. I would appreciate some advice.