We currently have all these life stages of a pineapple at our house. Whenever we purchase one, we always stick the top in the dirt after cutting off. Sometimes we bring home a whole bag full of tops from farmers market. One of the vendors takes the tops off for customers and she lets us take them! From top to new fruit it takes about 18-20 months. But there is nothing like backyard pineapple.
A few weeks after putting the top in a pot outside, the leaves begin to get a bit longer and sharper.
Then, out of nowhere, one day you discover a little baby pineapple inside!