2. Twist the leaves off the top of the pineapple. Grasp the body of the pineapple with one hand and use the other to grab the leaves at the base and twist them off. This method ensures that the base of the leaves will stay intact. It will be attached to a minimum amount of fruit, which you don't need in order for the plant to grow.
3. Strip off some of the lower leaves to expose the stem. This helps the stem sprout roots once it is planted. Strip until a few inches of the stem are exposed. Cut away any remaining fruit without damaging the stem.
4. Turn it upside down and let it dry for a week. The scars where you made a cut and removed the leaves will harden, which is necessary before you take the next step.
5. Fill a large glass with water. The mouth of the glass should be large enough to fit the pineapple crown inside, but small enough so that you can prop it up to keep it from getting completely submerged.
6. Stick a few toothpicks into the pineapple crown. Place them across from each other near the top of the stem. Push them in just far enough so that they'll stay in place. These toothpicks are used to suspend the pineapple crown in the glass of water.
7. Put the crown in the water. The toothpicks should rest on the rim of the glass. The stem should be submerged in the water, and the leaves should stick out the top.
8. Place the glass in a sunny window and wait for the roots to sprout. It should take several days or up to a few weeks for white roots to poke out and begin to grow.
9. Prepare a pot of soil for the crown. Fill a 6-inch pot with light garden soil that has a 30% blend of organic matter. This has the right blend of nutrients for the pineapple plant.
10. Plant the pineapple crown in the pot. Plant the crown when the roots are a few inches long. Wait until they've gotten long enough to take root in soil. If you plant the crown too early it won't do well. Press the soil firmly around the base of the crown without getting any soil on the leaves.
11. Keep the plant moist and warm. It needs a sunny, warm and humid environment where the night temperatures won't drop below 65ºF (18ºC). If conditions are dry, mist the plant regularly.
12. Give the plant food and water. Water the soil lightly once a week. Fertilize the plant with half-strength fertilizer twice a month during the summer.
13. Look for flowers. It can take several years, but eventually a red cone should appear from the center of the leaves, followed by blue flowers and eventually a fruit. It takes about six months for the fruit to fully develop. The pineapple will grow from the flower, above ground, in the center of the plant.
References from: Wiki How