Some ideas will be posted here. Feel free to add your own.
Crabapple Sun:125 Recharge: Slow Weapons: Shoots out seeds like a starfruit, but with 8 shots. When the zombies get too close, a crab claw comes out of the apple and cuts zombies, doing 5 damage. Attack speed: peashooter Appearance: An angry apple.
The Tree of Wisdom Sun: 300 Recharge: One allowed. Weapons: If your ToW is a certain height, it will be stronger.
1-10 ft: Peashooter with 2 damage
11-30 ft: Butter blasting
31-50 ft: Butter with double fire rate.
51-75 ft: Melons with Peashooter fire rate
76-100 ft: Melons with Repeater fire rate
101-200 ft: Winter Melons with Repeater fire rate
201-500 ft: Buttery Winter Melons that do 6 damage and Repeater fire rate
501-1500 ft: Buttery Winter Melons that do 8 damage and Repeater fire rate
1500+ ft: Explosive corn cobs fired every 10 seconds, and the melons.