Ummmmmm. . . I don't advise keeping one in with a betta. Bright enough light for a pineapple will likely heat the water up very quickly, and could be lethal for your betta. They do prefer warmer than room temp, but if the water heats up too quickly (more than 2 degrees an hour), you can kill your fish.

Thanks for the other info. though! I was just coming to this forum today to look for instructions on growing a pineapple! What a coincidence! =)

Actually, I just had mine in the kitchen near a window and they both did fine, the betta and the pineapple. My betta died of old age, I suspect, it was 5 years old!

One of my pineapples grown from tops (I have two) has gotten so big that it is dangerous to my son, on whose desk it sits. The leaves have twisted around to get the light from the window it sits beside, and I really don't have another sunny window in the house where it would fit. Is there any way I could move it outside? What low temps will pineapples tolerate? We live in central South Carolina, where it does get below freezing, but it generally doesn't stay there for long. Is there any remedial care I could give it during cold snaps that would allow it to survive the winter?

Thanks for your help.

Rachel