Few things can impart such a feeling of satisfaction as a well-tended garden. As he surveys his roses from the comfort of his deckchair on a warm summer's evening, Brian Lawless can relax and forget for a while the long struggle with spray gun and secateurs. But soon he must return to the fight. Slugs and snails are stirring. Beneath the ground, weeds are beginning to sprout. Soon the hedges will need trimming and the lawn will need mowing. Before long the leaves will be falling and the gardener's year, with all its frustrations and delights, will begin again.