Plot: At Longmeadow, Monty shares his tips on how to feed the birds over the coming months, plants raspberries both in the ground and in a pot, and makes a start on lifting his tender salvias. Joe Swift visits a nurseryman in Essex who loves to experiment with ornamental grasses, and Arit Anderson meets Fergus Garrett, head gardener at Great Dixter, to discover how the planting and garden management have increased biodiversity