I've been thinking of a less ambitious version of Bartomeus' farming enchantment, here: OOC chat - #578 by Bartomeus
Does this seem legit?
The Bloom Stick
This nondescript almond tree branch, when used to draw a circle or circumscribe an existing one, ensures that the plants within it grow well as long as the circle remains unbroken.
CrHe base 1, R: touch +1, Target: circle, Duration: Ring +2, 50 uses per day for +6 levels = level 10