Growing an avocado pit (or stone) is an interesting project for a child and a fun way to grow an attractive houseplant for free.
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To grow an avocado pit:
1. Find a ripe avocado. Avocado pits are most likely to grow if they come from a ripe fruit. When you eat the avocado pear, clean off the pit and then soak it for 48 hours in warm water. If you can keep the water warm (in a propagator or on top of a heater), then the pit will grow more quickly.
2. Find the top. Most avocado pits are egg-shaped, with the bottom broader than the top. Some are rounder, but the top is always smooth and the bottom, wrinkled.
3. Find a container. If you want to see the roots grow, you will need a clear container, such as a tumbler or a jar. Otherwise, a plant pot will do fine
'Plant' your pit. To see the roots grow, you need to suspend the pit above water. Find 3 or 4 toothpicks or hair grips and push them into the pit gently, until they will just support its weight. Then fill the container with warm water so that the bottom of the pit just touches the water. If you're using a plant pot, then bury the pit in potting compost so that half of the pit is still above the soil.
Keep warm. Warmth is the key to getting an avocado pit to grow. The ideal temperature is around 70 F. At this temperature, the pit should start to grow in around 10 days. At cooler temperatures, it can take 5 weeks.
