Epic Gardening founder @KevinEspiritu explains how selling raised garden beds kicked off the process that took his media business from $250K to $7.1M in under 3 years: “The beauty of having content is that you kind of get a pre-validation engine for what you might want to put out there. There was this raised bed I had — a metal garden bed that had been sent to me — and I was like, this is the thing I get asked the most about, so I’ll figure out how to sell it." "I didn’t even know who gave it…