For Christmas, I was given a lovely potted pineapple plant with a golf-ball size pineapple in the center. In the last 3 weeks the pineapple has turned yellow but not increased in size. What should I do ?
These type pineapples will never get as big as one you would see from the store. To do so would require that you live in the proper area, OR that you can provide its natural conditions in a larger pot of at least 5 gallons. More is much better though.
This article will help: https://www.gardeningknowhow.com/edible/fruits/pineapples/care-of-pineapple-plants.htm