Gardening Questions Rhododendrum questions

Is it in ericaceous compost? I am asking as they only thrive in acid soil. I also know that some years they have a rest... mine used to, anyway!

Clay soils tend to be acidic so Rhododendrons should be quite at home in it . Id be tempted to take it out of pot and plant it out.

I also have a large rhododendron that is having a rest this year. It's flowered every May. However, my wife dead-headed the flowers quite brutally last year ... perhaps this is a facor.