My big huge Coffea is no more. Sort of. It always was multiple plants in the same pot, but the biggest one started dropping leaves and branches after it came in for the winter. Eventually I chopped off the top 5 feet / 1.5 m, give or take, but the leaves are still falling, just more slowly. I'm not sure what happened; my best guess is that having the plant sitting on the cold concrete floor of the plant room was too cold for too long. Though that wouldn't explain why the next-largest plant in that pot has done fine, and has added about a foot and a half (0.5 m) of new growth during the winter even though it was in the same soil.
Possibly light was a problem too: the Coffea had been living in the northwest corner of the plant room, which was cold, but bright. It was too big to put back there this winter, though, so it wound up further from windows, getting a lot less light.
In any case. The plant is dead(-ish), but it lives on in spirit, because I'd harvested a ton of seeds from it before it died, and those seeds have been sprouting for a few weeks now. (The tiny first batch took 57 days before the first seed did something visible, the big second batch took less than 67 but I don't know how many exactly; the big third batch took 45 days, and I'm still waiting on the big fourth batch; so far it's taken about 44 days, so I should be seeing sprouts very soon.) I've been pulling seedlings out of the vermiculite and potting them into soil when I see the seed leaves, like this:
I've been putting three seedlings together per pot, and I'm already up to 26 pots, plus six pots from last year. It's theoretically possible, based on the number of seeds I harvested, that I could wind up with 150 Coffea plants at some point. I do like Coffea arabica a lot, and I never want seeds I start to fail, exactly, but in this particular instance I wouldn't mind if . . . fewer seeds succeeded than usual.