You can always link to this page:
http://garden.org/blogs/view/J...
So go to your profile, then click on "Change your public profile".
In the section for "Signature appearing below your posts:" you can place that link. You can use the [url] tag to make the link into words, like this:
[url="http://garden.org/blogs/view/JuneOntario/"]View my blog![ /url ]
which will then look like this:
View my blog!
(Just remove the spaces from the "[ /url ]" to make it work.)