Posts on the blog have a Creative Commons license – anything can be freely used elsewhere so long as it is a non-commercial purpose and attributed. That's always indicated at the bottom of the page.
With the Garden, I decided to remove that license. The garden is like my personal wiki, my scratchpad, where I can plan and build, and what I build here may turn into anything. The WordPress version of the Garden hosted the working copy of "It's Only Words" which will be released in book form so this isn't the kind of thing I want freely used elsewhere.
There's something in the air. Both Jan and James have been looking at ways to post replies/responses on their blogs, and send webmentions, without those replies showing on their sites and in their feeds.
It's a nice idea.
The only issue is that webmentions are supported by so few sites, it's not really worth it for me to implement something like this. Yet.
If using brid.gy to send replies to social networks without having to actually use those networks then maybe. But I don't. Having to check if a site accepts webmentions before replying is a bit much.