In early spring I planted two bare-root plum trees - one Opal, one Marjorie's Seedling, sold as 2 year bush plants. They're planted in the front lawn, with mulch mats around the base. One of them started sprouting leaves quite early and seemed healthy, but now many of the leaves are turning yellow and dropping off. Also the ends of each branch looks almost like something has eaten the growing tip off, but it's the same on every branch.
The second plum tree took much longer to start growing, and the leaves when they came didn't look healthy, kind of curled and sometimes mottled yellow. Newer growth looks healthier. It also produced some blossom in late June so is clearly a bit confused.
Is this just normal stress for a newly planted tree or are they struggling to be established, or suffering from over or underwatering or lack of food or something else?
Soil here is quite heavy clay. I have been watering them regularly especially when the weather is hot and dry.
Embarrassingly enough, I can't remember which one is the Opal and which the Marjorie's Seedling!
Any advice appreciated.