Now I remember

The cucumber plant is sending out male flowers, lots of them. Now I remember why I don't like to grow them indoors: these flowers make quite a mess when they drop from the plant.

At the very least, the notion that red/blue LED lighting is too weak, or does not have enough spectrum, to bring a plant to the flowering stage has been dispelled.

I suspect, though, that I have a long wait until I see a female flower. However, in six more weeks I will be starting my greenhouse plants, and this project will end, cucumbers or no cucumbers. Time will tell..