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Grow an Avocado Tree from the pit (for a houseplant, it probably won't produce fruit). After drying, the pit is suspended in a glass of water and once there is root growth of about 2″, it can be planted in a pot of soil and tended to as a houseplant. If your climate allows, you can plant this outdoors.
How to grow an avocado tree Wrap in moist paper towel and place in a ziploc baggy, seal. Place bag in a warm, sunny spot or somewhere warm (ideas: top of fridge, your computer monitor, television, under sink). Once it starts sprouting and the roots are about 2″ long, plant in 10" diameter pot. Water when soil is dry, feed plant food 1/2 times a month.