Your C. bulbispermum sounds just about right. They make large clumps with lots of offsets over time. Some of the bulbs can be truly huge. I like it because of the blue-green foliage and the distinctive leaves that taper to a long tip, also because it is evergreen here. Most species lose their leaves when temperatures fall a few degrees below freezing.

The offsets will eventually become large enough to flower, it will take a few years. C. bulbispermum does not seem to be reluctant to flower.

Cordially,