I was tooling around with Agricarnations trying to determine their area of effect so that I could see if they'd be useful around my Ender Lily & Essence Berry farm.

I discovered that they have a 6 block radius, in the cardinal directions and vertically, around the block on which they are planted, not the Agricarnation itself. Is that the intended area of effect?

Also, in plants that grow stacked on top of each other, like bushes, only the top most plant in a vertical stack appears to be affected.

Tested on build 101.

This is all intended behaviour, yes.