Keyhole gardens are where you build a compost pile in the middle of a raised bed or hugelbed to keep it warm in the winter and to provide nutrients and worms, etc. Pretty cool idea.
There are some pretty neat ideas on that website. Not just keyhole gardens.
It's never too late to start! I retired to homestead on the slopes of Mauna Loa, an active volcano. I relate snippets of my endeavor on my blog : www.kaufarmer.blogspot.com
"Don't believe every tiny ad you see on the internet. But this one is rock solid." - George Washington
grow your own garden and build your own home in the gardening gardeners program