There are three members of this amazing South African genus: Boophane disticha; Boophane ernestii-ruschii and Boophane haemanthoides. All have very large bulbs, which are toxic to cattle, the pollen of the flowers also being somewhat irritating to the eyes, giving it one of it's common names 'Sore Eyes'.
Boophane disticha, seen here, is the most commonly grown, and the one I have been able to grow from seed to blooming size successfully. It took my bulbs nine years to bloom, but others report success in seven years. This species grows in both the summer rainfall regions of South Africa and the winter rainfall regions, so it is important to know the origin of your seeds or bulbs, since they will grow at different times of year. The bulbs I grow are from the summer rainfall regions, and produce their leaves in spring, blooming before the leaves appear (April for me). They are not self- compatible, so you need two blooming plants to produce seeds. Even without flowers, the bulbs are highly ornamental since the bulbs produce a neat fan of wavy grey leaves.
I also have Boophane haemanthoides. My only large bulb is eleven years old, and has not produced a flower yet. This species comes from the winter rainfall region of the western Cape Province of South Africa and is just now producing its leaves. Here is a picture of the fan of leaves.
After blooming, the umbel of both species enlarges considerably as the seed ripens. When the seed is ripe, the whole seed head breaks off, and the wind will tumble it across the landscape, scattering its seeds as it goes. The seeds are known as 'recalcitrant' seeds, meaning that they will germinate immediately and can't be dried or stored. They are soft, and like small fresh peas. Here is the seed head of B. disticha - compare the size to the flower size above.
Boophanes have very extensive fleshy roots that need a lot of room. I grow mine in pots that are about 40cm (16") in diameter, and about 50cm (20") deep. They are often grown in a mix that is mostly sand, but since that would make the pots so heavy I would have trouble lifting them, I use a mix that is about 30% organic material (ground bark), 30% horticultural pumice and 30% perlite. I fertilize regularly during the growing season with a liquid balanced fertilizer, and allow them to go completely dry in the winter. I have not found them difficult, patience is the most important ingredient for growing them to blooming size, plus giving them enough root room.