I've had a Bird of Paradise for about two years and it has done well in its current location, which is an office building with three huge, west-facing windows so it gets bright indirect light most of the day and a few hours of direct light in late afternoon. I water it every other week and fertilize it twice a year with a slow-acting fertilizer according to label directions.
It put out a new leaf in year one (top right leaf) and then around the beginning of 2023 it put out the new sprout you see in the center. That sprout was developing normally for the first few weeks and then it just stopped. It's still bright green, still looks healthy, but it hasn't grown in months, not even a little.
I'm baffled what could be the problem. A friend who's more knowledgeable about plants than I was also baffled. Any ideas what the problem could be?