Crowd Corntrol

Crowd Corntrol's corn cobs seek out the tile with the highest zombie density over an unlimited range before causing a powerful explosion that scatters the crowd, knocking them half a tile away from the blast epicentre. It takes four seconds to reload.

Overview
Crowd Corntrol is resemblant of a cross between Kernel Corn and a Cob Cannon. The blast from an attack deals 15 nds (I'm not sure how balanced this is, help me out here) and knocks zombies in the epicentre (The full AoE is a 1x3 but it only applies the knockback to zombies in the centre) one tile away from the centre of the tile (which Crowd Corntrol always targets) either forward or backward. The projectile will always be able to locate its target and cannot be blocked or negated. As it seeks out its targets, it also cannot be dodged. If the tile it is targeting contains more than four zombies, it gets triggered and deals double damage for that attack. It will not deal double damage again unless the next tile it targets also has more than four zombies.

Plant Food effect
When fed Plant Food, Crowd Corntrol yells a battle cry and fires off an airstrike of butter than falls on eight random tiles (reference to GW2 Kernel Corn. This butter would immobilise the zombie it hit... if it didn't explode on contact, dealing a 30 nds wallop to the highest health zombie in the that tile! Ouch.

Strategies
Crowd Corntrol is an incredibly helpful addition to defenses that lack proper AoE defenses. It's useful in midgame as the blast can help scatter hordes and make them more manageable (as well as soften them up a little with its powerful attacks). It retains its usefulness in huge waves as the high zombie density ensures each and every shot will go to good use, especially with the double damage missiles.

However, with its high cost, impracticality and slow recharge speed, it is not ideal for use in early game, and using it involves a risk as the blast has a chance of knocking dangerous zombies forward toward your defensive line. Its effect is also rather slightly self-limiting as it involves breaking up hordes, but it can mean future shots become less effective as it becomes unable to utilise its AoE and special effect to the max.

Nonetheless, it is a decent plant ideal for crowd controlling and is a viable option in most situations.