In Grow a Garden, gear can be used to speed up plant growth, increase mutation chances, and more.
You can purchase gear using Sheckles or Robux from the Gear Shop at the end of the map.
Around the Gear Shop contains the Pet Eggs Shop, Cosmetics Shop, Pet Mutations, and others.
The Gear Shop stock is the same throughout all servers and resets every 5 minutes with new gear.
This article contains a Trowel gear wiki in Grow a Garden, including its effect, tier, cost, and more in Roblox.
Grow a Garden Trowel Wiki

Gear Shop
100,000 Sheckles or 49 Robux
Common
Moves a plant to a desired location in your garden (5 uses).
The Trowel in Grow a Garden is a common gear item that can be purchased from the Gear Shop.
It costs 100,000 Sheckles or 59 Robux and will always appear in the shop.
You can use it on a plant to move it, and it has 5 uses per purchase.
The Trowel also allows you to rotate a plant before placing it in your garden.
Further reading
Grow a Garden Watering Can Wiki