Lychee-pult

The Lychee-pult is a plant that lobs lychees. Lychees do 5 NDS Lychees also slow down zombies. Sometimes the seed gets in the zombie's mouth, paralyzing zombies for 10 seconds. After that, the said zombie's teeth break. halving damage done. Same applies for Zombotanies (although it is unknown how.

Strategy
Put these in the back, as they are VERY frail. Also they lob fairly slow. Those drawbacks can be very annoying, but play them right and the will serve you well.