Avocados are quite easy to plant from seed. Unfortunately for avocado lovers, most areas of North America are too cold to support an avocado tree in the landscape. Luckily, avocado trees can easily be grown indoors as an attractive houseplant. If you intend to grow your tree outdoors for the sole purpose of harvesting its fruit, you may be better off planting a seedling. Depending on the variety of avocado seed that you have planted, it may take anywhere from five to 15 years to harvest its fruit.
Place the large container on a plant stand that will allow water to drain out of the holes in the bottom of the pot. Move the container and plant stand to a spot in your home that receives indirect sunlight for most of the day.
Fill a large potting container that has drainage holes with potting soil to within 1/2 inch of its lip.
Plant the avocado seed in the center of the pot. Orient it so that its flat, wide end is facing down and its point is facing up and sticking roughly 1 inch out of the surface of the soil.
Water the soil with a watering can until water drips out of the drainage holes. Check the soil's moisture level frequently and keep it moist at all times until the avocado seed becomes firmly established.