I have had this plant about 3 years and it is a nice plant with less leaves and no flowers yet. I repotted it in the spring and it lost its outer two leaves. Its it now in dapped shade outside and showing new leaves inside. I have read this plant needs to keep the same angle to the sun to do best and I rotated it to match inside conditions. It mostly seems to be languishing. We just warmed up for summer where it went 60F day to 50f night to 70-80F day and 70 night, maybe that will help.
Haemanthus albiflos blooms in the fall/early winter for me. It should bloom a little earlier for you since you get colder earlier. They do like being in bright shade. They aren't going to do much between now and Sept.-Oct. This is one of only a few evergreen Haemanthus.
I keep all of my Haemanthus on a lower shelf so that they get very little direct sun, don't water them at all, and they bloom their little heads off for me. In habitat they're usually in ground that becomes baked in the summer even though they grow in the shade of shrubs, low trees or tall grass. In containers they like to remain undisturbed and seem to appreciate being crowded.
I don't water them at all - I just let Mother Nature take care of it. That means that most years they get watered from Oct.-Nov. to Apr.-May. This year we had good hard rains into June. They won't get watered again until it starts raining in the fall.
Some Haemanthus are summer dormant, some are winter dormant, and a few are evergreen. H. albiflos is evergreen and gets a little sluggish at this time of year, but if I were to water it it would continue to make new bulbs. They're supposed to be kept moist during their growing season, but that happens naturally here so I don't even think about it.
You mentioned that about the sun before. I've never paid attention to that, and haven't had any problems. My "Bulbs" book doesn't mention it either, nor does my book on Haemanthus. This could be because of the difference in our latitudes. Or did you read that somewhere?
Plantzafrica is an awesome reference tool for many kinds of plants. I use it a lot, but I hadn't read the info on H. albiflos. I've now read it through three times, and cannot find where it mentions that the bulb should be placed in the same aspect it was before it was repotted. Would you please direct me to the specific paragraph? Sometimes I can't see things even though I'm looking right at them.
When it says "likes to remain undisturbed for many years" it means that the bulbs like to stay planted where they are currently planted and not be removed from the soil and moved somewhere else. It's not that the pot needs to be positioned the same all the time.
Nancy's exactly right. In addition, it also means that if they're in a container they like staying there rather than being repotted regularly. If repotted regularly, most of these kinds of bulbs will not bloom for a year or two after repotting. And "dappled shade position" means part shade, part sun, not actually anything to do with the position of the bulb itself.
Another thing I just thought of - as long as your temps are above 40F most of the time and the plant is protected from frost, it should do just fine outside. Where I am is a Mediterranean climate, so I only have a few days above 90F and a few nights below freezing. In the winter it's mostly 35-40F at night and 45-55F during the day. In summer it's mostly 50-60F at night and 65-75F during the day.