As the flowers on rhoddys are now on their way out or have finished completely, now is the time to remove the spent flowers on dwarf varieties or other plants of manageable size. Remove the spent flower clusters as they turn brown, trying to do so before the new leaf shoots start to develop below them to avoid damaging them.
Bend the flower stems over to break them away cleanly. Alternatively, if they are too tough to break, use a sharp pruning knife or secateurs to cut them off.
Whether you remove the spent flowers or not, to maximise the health of the plant and encourage good growth, feed with an ericaceous fertiliser.