Needlestorm

A favorite of cold-forest and desert druids, needlestorm causes the spines on any pine tree or similar needle-bearing plant to spray out in a deadly barrage. The shower of needles has a radius of approximately 1 foot for every 2 feet of the subject plant's height.

Everyone within this area suffers one attack, which inflicts 1d12 points of damage for every three full levels the caster has achieved. Thus, a spruce tree enchanted by a 7th-level character attacks with a THAC0 of 16 and inflicts 2d12 points of damage.

[Complete Druid's Handbook]

Druidic

Sphere: Plant
(Alteration)
Level: 4

Range: 60 yards
Components: V, S, M
Duration: Instantaneous
Casting Time: 7
Area of Effect: 1 tree or plant
Saving Throw: Save vs. spell for half damage

Material Components: a spine from a needle-bearing tree or plant (consumed)