Euphorbia canariensis can grow in a tough, rocky environment

Peter Dowdall wonders at the ubiquity and range of a hardy perennial whose sap can cause a severe rash.

Many of the summer flowering perennials will benefit from being tidied up now and having spent flower stems removed, or else you will end up with a bedraggled looking garden.

Delphiniums, Lupins, Leucanthemums will all have produced many flowers by now and should have the first of their flowers, which have now gone over, removed.