When a plant growth spell is cast, the wizard causes normal vegetation to grow, entwine, and
entangle to form a thicket or jungle that creatures must hack or force a way
through at a movement rate of 1 per round (or 2 if the creatures are larger than man
size). The area must contain brush and trees for this spell to work. Briars,
bushes, creepers, lianas, roots, saplings, thistles, thorn, trees, vines, and
weeds become thick and overgrown so as to form a barrier. The area of effect is
the caster's level, squared, times 100 square feet. This area can be arranged in
any square or rectangular shape that the caster desires. Thus, an 8th-level
wizard can affect (8 x 8 =) 64 x 100 square feet, or 6,400 square feet. This could
be an 80-foot x 80-foot square, a 160-foot x 40-foot rectangle, a 640-foot x
10-foot rectangle, etc. Individual plant girth and height is generally affected
less than thickness of brush, branch, and undergrowth. The spell's effects
persist in the area until it is cleared by labor, fire, or such magical means as a dispel magic spell.
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