First, wash off any bits of avocado meat that are on the pit. Carefully stick four or five toothpicks evenly spaced around the middle of the avocado pit and rest the toothpicks on the rim of the glass of water, making sure that the wider end (the bottom) of the pit is in the water. It might be hard to tell which end is which with some pits. Whatever end was toward the pointy part of the avocado is the top. Place the glass on a sunny windowsill. Check on it daily, refilling the glass so that one-third to one-half of the pit is in water at all times.
Your patience will pay off when the roots begin to grow, followed by the stem and leaves (the amount of time to sprout can vary from two to eight weeks). You might want to start two or three pits in case one of your avocado pits is a dud. When the plant is about 12 inches tall, transfer it to potting soil in an eight-inch pot and cut one-half inch off the stem to encourage more fullness.
To help make your houseplants healthy and beautiful…