[oneeyedpigeon]

I assume they mean "a famous gardener". Here in the UK, there are at least two household names that present gardening shows, whose endorsement on such a product would be a huge pull.

[mplewis]

That’s incorrect. See: https://en.wikipedia.org/wiki/Master_gardener_program

[oneeyedpigeon]

Ok, so it is a US (well, North American) thing? I stand corrected.