Best ways to collect your seed
■ The freshest seed will come from your own plants and in a foray around our plot I found holly, acorns and hornbeam. Collect on a dry day when the seeds and their cases are dark brown and crackly. You can buy seeds from Chiltern Seeds (✆ 01491 824675 chilternseeds.co.uk) and Tree Seed Online Ltd ( treeseedonline.com). Joining the Hardy Plant Society ( hardy-plant.org.uk) is a great idea.
Collect seeds when they are dry