Countless caterpillars, water wise veg growing and herb of the month

This week on Gardeners’ Corner with David Maxwell; why are there so many caterpillars this year and do the spooky webs some are creating spell doom for the plants they cover? At Helen’s Bay Organic Farm John McCormick has some tips on growing courgettes and how to get better veg without wasting water. Helen Mark travels to Stranocum for a masterclass on early summer pruning with Don Kerr and Jekka McVicar reveals her herb of the month. Also on the programme, Katie Bell from Ulster Wildlife and Claire McNally, head gardener at The National Trust’s Rowallane join David in studio to answer questions sent in by listeners. Email the programme on gardenerscorner@bbc.co.uk