Not sure where to post this, but this looks like the best place....

I've got two coffee plants that are doing fine - except for the lack of fruiting. Lots of new leaves, robust and shiny, but no blossoms. My "harvest" last year was but 5 cherries, which were processed with the 'wet' method. Not quite enough for a single cuppa....

I'm trying to grow them in as good a situation as I can arrange: high (as in 'up') shade, since coffee prefers an under-story location in its native environments, in soil that has lots of perlite for rapid drainage - like you'd find with volcanic soils. Even moisture and regular fertilization. The plants look quite happy. I'm not....

The plants winter in the greenhouse. They drop a lot of leaves each time and don't like being indoors all that much, but come back like gang-busters when put back outside in the spring.

Suggestions?