Hi, these flower from summer to autumn, for free standing plants they're pruning group 9, which means a light trim, early to mid spring, if they're grown against a wall, it's pruning group 13, which means you can cut back to 2 or 3 buds from the main framework, for Myrtle this is also in spring, unfortunately they need a long, hot summer to flower, Derek.

Any shrub or climber that flowers from July onwards, is carrying the flowers on new wood. So in answer to your question, you are not cutting off the wood that will carry the flowers. But as Derek says, myrtles need a long, hot summer to flower. Fingers crossed we get a good one again.

Thanks for the information. This shrub is quite established and I seem to think it has always given us flowers. It is in a sheltered sunny spot so maybe that helped. It just need tidying up.