The Sims 4 Avocado comes with it.

Avocados in The Sims 4 come with it and do not need to be purchased. Citizens can start to learn gardening skills (planting/watering/weeding/harvesting) by taking care of plants. They can automatically obtain 1 as soon as they start using gardening interactions. Level gardening skills. You can also learn by reading gardening skills books.

Gardening Skill:

As citizens continue to use the gardening interaction, they will gradually increase their gardening skill level. The easiest way to level up your skills is to spend more time taking care of your plants.

The "Free Botanist" ambition can give citizens the "Collector" trait to collect rare collectibles faster, while also rewarding you with generous satisfaction points.

Citizens with the "nature-loving" trait will be in a happier mood when learning skills outdoors.

Purchasing the "Super Green Thumb" feature from the reward store can help citizens reduce the frequency of watering/weeding/fertilizing.