Now is an ideal time to divide herbaceous perennials. Not only will you get more plants but you'll get healthier ones too. If you took cuttings of tender perennials last summer now is a good time to start potting them. Cut back ornamental grasses and other perennials. It is best to remove older, dead and damaged leaves from around them too as this reduces disease risk. Deadhead your daffodils while you are at it but leave the leaves to die down naturally as this gives the bulbs lots of nutrients to re-shoot next year. Now is also a good time to start feeding other plants in your beds and borders. A general purpose fertiliser is ideal.