Level 5: The Take cutting and Graft interactions are unlocked.Talking to plants will also boost your Sim’s social moodlet. Level 4: The Talk to plants and Harvest area interactions are unlocked.Level 3: Your Sim can now fertilize plants, and their fun moodlet increases while gardening.The Water area and Evolve interactions are unlocked. Level 2: Your Sim can now research gardening on the computer, which will help them gain more skill.Level 1: This is the base level that lets you buy all Starter Seed Packets and perform basic plant interactions.Like all skills in The Sims 4, leveling up unlocks new interactions for your Sims.
Everything you need to know about gardening in The Sims 4.