Sonic Prune

Overview
Sonic Prune is an instant-use plant that emits a sonic boom that covers 3 lanes and moves outwards, dealing 10 NDS to any zombie it hits.

Trivia

 * my original image unfortunately doesn't seem to show up here, so feel free to make your own image to add here (remember, it's a light-purple prune with a little green antenna on it's head with a blue ball attached to it)
 * the sonic wave can hit zombies at any height
 * it is a portmanteau of 'Sonic boom' and 'Prune', the dried form of the Prunus domestica, or Common Plum.
 * I used prune instead of plum because a) before i looked it up i thought they were different fruits, and b) 'Sonic Plum' doesn't sound as good.