Dologaren - avocado trees prefer very sunny conditions. They do better outside than in. Full sun. If your winters do not get below 9 - 10 degrees C you can leave it outside. The soil should be just damp. Yellowing leaves indicate overwatering. Don't let it sit in water. Ditch the pot saucer or make sure it does not retain water. As you plant grows pinching the top 2 sets of leaves will encourage lateral branching. When given the right growing conditions they grow rapidly. Transplant annually in the spring. If you have the yard space and mild winters plant it in the yard when it gets about 3' tall.
An avocado tree can reach 40' in height.
Don't expect fruit that resembles the parent. Store bought avocados are hybrids. Your tree may or may not produce after 10 years or so but the fruit will not resemble the parent. It may or may not bee edible.
They are a fun and interesting plant to grow. If you have a very sunny window and keep it indoors it will outgrow your home in a few years. It is a tree. Start a new plant every couple of years so you can replace the plant when it gets too large.
Elizabeth - or Your Majesty
Living and growing in Lafayette, La.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant. ~Author Unknown