Diminish Plants

(Player's Handbook v.3.5, p. 221)

Level: Druid 3, Ranger 3, Blighter 3, Death Master 3, Urban Druid 3,
Components: V, S, DF,
Casting Time: 1 standard action
Range: See text
Target: See text
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No

This spell has two versions.
Prune Growth: This version causes normal vegetation (grasses, briars, bushes, creepers, hedges, thistles, trees, vines, and so forth) 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.
Stunt Growth: This version targets normal plants within a range of 1/2 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.