Posted: 15/05/2017 at 11:52
what sort of cornus? Have they got leaves?
Feeding doesn't help until they're growing
What is the soil like outside the compost? If it's heavy clay it can be difficult for roots to move from the compost to the clay. Were they bare root or in pots. If they were in pots were they pot bound and did you tease the roots out a bit if they were.? They don't take up moisture well if they're like that.