The BBC has one of the most wide-ranging and best quality web-sites in the world. The gardening and nature sections justify its reputation.
The gardening section of the website is based largely around recent and current programmes and there's plenty more besides. You can go straight to the gardening section of the BBC's website at
http://www.bbc.co.uk/gardening.
There is also much of interest to the wildlife gardener at the nature section of the site. For example, there is month-by-month calendar for the wildlife gardener by Chris Baines at
http://www.bbc.co.uk/nature/plants/calendar (viewed 27th March 2003).