Pyracantha

I planted 4 Pyracantha (red) plants in early spring. Three have bloomed, grown well and have berries forming. One is weaker with no berries forming and not much growth. They are about 4 feet apart and soil conditions are the same for all, a clay based soil with compost dug in. The weak plant has some yellowing leaves. Any ideas?

It is not happy-if you are gardening on clay that means you have poor drainage-yellowing leaves is often a sign of over-watering-I would be inclined to lift that one as it has only been in a few months and inspect the root ball-is it sodden?-are the roots confined?

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