Message/Chat/Forum rd=gardening
Access to a range of bulletin boards, covering house plants,  garden design, pests and diseases, allotment tales.
Run by  Kitchen Garden - monthly magazine devoted to vegetables, fruit and  herbs.
The email list for the Organic UK web site - discussing organic  gardening. For beginners and 'old hands', aimed mainly at organic gardeners in  the UK. o/organic-l
For organic gardeners
Bulletin board from Real Gardeners - mainly UK membership, but some  further afield.
Guide to  numerous resources gathered by the indefatigable URGlers