. . . . . "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."@en . . . "Upgrade plants"@en . . . . . . "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."@en . . . . .