This spell has two versions.
This version causes normal vegetation within long range (400 feet + 40 feet per level) to shrink to about one-third of their normal size, becoming untangled and less bushy. The affected vegetation appears to have been carefully pruned and trimmed.
At your option, the area can be a 100-foot-radius circle, a 150-foot-radius semicircle, or a 200-foot-radius quarter-circle.
You may also designate portions of the area that are not affected.
This version targets normal plants within a range of ½ mile, reducing their potential productivity over the course of the following year to one third below normal.
Diminish plants counters plant growth.
This spell has no effect on plant creatures.