I have been wanting to add this to my garden so I just looked up how to do it. My brother grew one in our backyard when we were younger and I thought it was so cool.
Cut the crown off of a pineapple fruit. Remove all the fruit on the crown and gently trim the stem of the crown until root buds are exposed. Allow the crown to dry in cool darkness for about one week. Any crown from a healthy fruit will serve to propagate a new plant, even one that’s been “harvested” from the local grocery store.
Plant the pineapple crown in an 8-inch clay pot with a light, rich potting soil. The soil should offer good drainage; excess water may prevent healthy growth. When the crown grows too large for the pot, transfer it to a 12-inch container. Pineapple plants may be container-grown for the rest of their lifetimes. The entire pot may be buried directly in the garden. After planting, a crown takes around 20 months to bear new fruit.
Fertilize pineapples when they’re initially planted, and again every two to three months. The plants do not need a lot of water, an average of 20 inches of rainfall annually. Unless conditions are extremely hot and dry, they should need watering no more than once a week. Cold temperatures will damage and even kill a pineapple, so it is advisable for gardeners in cool, northern regions to move the plant indoors. After flowers appear, the fruits take at least four months to ripen. Once half of the the hard shell around the fruit is yellow, it may be harvested.
Pineapples may be grown indoors for their entire lives, though new plants are likely to be slower in producing fruit and need at least 6 feet of head space. Give the plant plenty of daily sunlight, at least six hours, and keep the soil consistently slightly moist. When possible, move the plant outdoors during summer.
Keep in mind, most pineapples will take two to three years before they will start bearing fruit!!!