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Upgrade plants are upgraded versions of some plants, and the upgrades that must be bought from Crazy Dave's Twiddydinkies. To activate an upgrade, it must be planted on its weaker variant. They have a very slow recharge and a one-time cost that varies from $3,000 to $20,000.
There are a total of eight upgrade plants.
- Main article: Gatling Pea
- Main article: Twin Sunflower
- Main article: Gloom-shroom
Gloom-shroom is the upgrade to the Fume-shroom. It shoots four bursts of Area of Effect fumes into all adjacent spaces per round of fire. It costs $7,500 in the shop, and 150 sun during levels. If you use it in a daytime level, a Coffee Bean is needed for activating it, thusly upping the cost to 225 sun.
- Main article: Cattail
Cattail is the upgrade to the Lily Pad. It shoots two Spikes per round of fire that automatically home in on a target and can cover the entire lawn. They can also shoot down Balloon Zombies. It costs $10,000 in the shop, and 225 sun during levels.
- Main article: Winter Melon
Winter Melon Is the upgrade to the Melon-pult. It lobs frozen Melons that deal heavy immediate damage to its intended target, moderate splash damage to nearby zombies, and a slowdown effect to all zombies hit. It costs $10,000 in the shop, and 200 sun during levels.
- Main article: Gold Magnet
Gold Magnet is the upgrade to the Magnet-shroom. It periodically collects silver coins, gold coins, and diamonds for the homeowner. It costs $3,000 in the shop, and 50 sun during levels. Note that if you plant it on a sleeping Magnet-shroom, it will wake up again, without using a Coffee Bean.
- Main article: Spikerock
Spikerock is the upgrade to the Spikeweed. It spikes zombies at a rate of two damage per round of fire. It can sustain nine Gargantuar blows or tire pops. Its spikes are indicators of its remaining health, as it loses one big spike every three Gargantuar blows or tire pops. It costs $7,500 in the shop, and 125 sun during levels.
- Main article: Cob Cannon
Cob Cannon is the upgrade to the Kernel-pult. It is a reusable Cherry Bomb with a recharge rate of 36.41 seconds. Clicking or tapping the Cob Cannon will allow the player to select where to fire the Corn Cob. The Cob Cannon's Corn Cob can remove ladders, and is an instant kill. It costs $20,000 in the shop, and 500 sun during levels. It requires a 2x1 area of Kernel-pults to plant.
- Imitater cannot imitate an upgrade plant, excluding hacking methods, because the player may not have the upgrade plants when they purchase the Imitater. They can use a hex editor to make Imitater versions of them. However, the player can upgrade an Imitater version of a plant, it just will not be grayscaled.
- If a Pumpkin is placed on a Cattail, when the player removes the Cattail, it will downgrade into a Lily Pad without destroying the Pumpkin.
- In Plants vs. Zombies 2, the Twin Sunflower, Spikerock, and Winter Melon all appear as independent plants.
- In the Chinese version, Cattail and Gatling Pea are also individual plants.