“I hung an avocado pit in a cup of water, and it grew roots, and now has a crazy height of like 3-4 feet. I’ve read that I can keep them in a large pot outside, and they won’t outgrow it. Do you agree, and again, what should I use as dirt? Will an avocado tree in a planter actually produce avocados? Be kind since that would be a lot of dirt for a big planter!” Question from Joseph
Answer: Congratulations! Avocado trees can make nice house or patio plants if you have space. You have already discovered that they grow quickly, so planting yours in a large container with drainage is recommended–18 inches is a good starting size. Good potting soil for the job is Black Gold Natural & Organic Potting Mix, which is OMRI Listed for organic gardening. Indoor trees require lots of sunlight to grow well. Feed yours with a fertilizer formulated for avocados, and water evenly from spring to fall. Allow the pot to become somewhat dry before each watering. In winter, water a little less as growth slows. To keep your tree at a manageable size, prune off extra- long branches in spring.
In general, you need more than one avocado tree for cross-pollination. So, even if your tree blooms as it matures, it will likely not fruit, but if you start another avocado tree, you could get lucky.
Take your tree outdoors in a partially sunny spot in summer to encourage vigorous, even growth. Just be sure to clean it before bringing it back inside for winter, if you live in a cold-winter zone (click here to learn how to clean your plants before bringing them indoors for winter).
I hope that these tips help!
Black Gold Horticulturist