A Kee Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 96 hours, with 16 hours per stage. A Kee tree will yield 1-10 Berries. During its growth, watering the plant will add 0.2 Berries to the final harvest, weeding it will add 0.1, and removing a pest will add 1.
A Kee Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 72 hours. A Kee tree will yield 2-8 Berries.
A Kee Berry, when held by a Pokémon, will increase their Defense by one stage the first time they are struck by a physical move. It is consumed once used.
If blended with a Maranga Berry at the Lumiose Juice Shoppe, it will become Perilous Soup, resetting the drinker's EVs to 0.
The Kee Berry has an additional effect in the growing of Berries. When used to make Mulch, it produces Amaze Mulch, which combines the effects of Boost Mulch, Rich Mulch, and Surprise Mulch, greatly improving the yield of Berries and the chance for mutations.