Backlink URLS

You mean the anchor text or the hyperlink?
 
the hyperlink, so anchor is gardening and then that links to the url
 
As far as I know the hyperlink must contain either http:// or https:// , so you can't use just www.site.com for hyperlink. Other than that it's a good practice to use both www and non-www versions, but make sure you have more of the ones your actual url is, for instance if your valid url is http://www.site.com/ then you should have the vast majority of your links pointing to http://www.site.com/, and not http://site.com/. Hope that makes sense.
 
and you need to 301 the version you are not using to the other one so the link juice passes.
 
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