Clearheart's Selective Weed killer

The caster takes up a piece of the type of plant that they want to protect from this spell, and then causes a light mist of grey ash to fall in the area of effect. Over the next 24 hours all the plants not protected from this spell that are sized Medium or smaller will wither up and die rotting back into the soil.

Magical plants, intelligent plants, and plant based creatures are unaffected by this spell. 

This spell does not prevent new weeds or other undesired plants from growing back over time, but it does kill the ones that it effect's roots and all. The spell will not effects seeds that have not sprouted yet.

At Higher levels: At 5th level the area of effect is increased to 10 square feet, at 11th level the area of effect is 20 square feet, and at 17th level the area of effect is 40 square feet.

This spell is the work of halfling professor of agricultural magic Malvyre Clearheart of the Haven Bay school for the pursuit of agricultural and animal husbandry studies.