Other sites you may be interested in :

Local :

IPscene - a directory of community groups etc. in the IP postcode - this link is to the Gardening section, but there is so much more on there.

National Gardens Scheme - to find gardens to visit

Suffolk Gardens Trust - who conserve and protect Suffolk Gardens

Garden Organic - for organic gardening and the Heritage Seed Library

Blacksmiths Cottage Nursery - owned by the marvellous Ben Potterton!