I have them in 7-15 gallon pots-I put about 4 pups in ( if they are pineapple heads, I place them over water and let them root first)- the plants will grow quickly, if you do nothing to them-only water in times of significant drought. Don't put them in the ground, ever. I use regular potting mix with nothing else added. Dont fertilize. The plants will grow big and in less then a year, they will form a crown with fruit. Once they crown, pups will grow in, everywhere. Let them sit in there, root bound and all. They will fruit. I only start new pups when the old pots are spilling over..The following pineapple was from this past summer. I did root and plant the head, which is now large.