After eating a pineapple, don't throw away the top or toss it in the compost pile. Place the top of a pineapple on high-quality potting soil to grow a new pineapple. Pineapple plants are slow-growers, though, and typically not ready to harvest and eat for at least a year. Feed your pineapple plants properly to help the pineapple grow and develop.
Wait until the pineapple top starts producing new leaves before feeding the plant. This usually takes approximately four weeks. During these four weeks, water the plant when the top 1 inch of soil feels dry to the touch.
Mix a water-soluble fertilizer formulated for houseplants according to the manufacturer's directions.
Pour the fertilizer mix over the leaves of the propagule (pineapple top) once a month for the first six months. According to Texas A&M University, it takes the propagule 6 months to develop a proper root system and the plant benefits from having the leaves directly fertilized.
Pour the fertilizer mixture directly onto the soil instead of on the leaves after the plant's first 6 months. Continue fertilizing the plant monthly until it is time to harvest.
Cut off the top of the pineapple before you eat the fruit, and start the process over again.