From Brotato Wiki
Garden is an in-game item that can be bought from Shop or can be found in a Crate. Most Items increase the Stats of the player while some of them provide unique effects.
The Garden item spawns a small garden at the start of each wave for each Garden item you have. Each garden drop consumables as soon as they spawn, and then continuedly spawns fruits throughout the wave with a 15 secound cooldown.
The Pruner weapon also spawns gardens that produce fruits with a 15/14/12/10 second cooldown.
Gardens are Structures, so they benefit from Improved Tools, reducing the cooldown of fruits spawning and it grants +2 Armor per garden to Streamer.
The healing of the fruits can be increased by Lemonade or Weird Food and can grant Max HP if you have the Extra Stomach item. Or extra harvesting for the Farmer and Explosive Damage with Glutton.