I'm hoping someone can tell me whether this is a solitary sort of plant, or if it develops side sprouts of some kind.

At the moment it is standing on a skinny little stalk which is holding up a thumb-thick top, which is in leaf and flower. Seeds have set but have yet to ripen. It's coming up for 30cm high and I've had it for about 18 months. It's grown about 10cm in that time.

(As it's in good health, I've either done something right - or it's amazingly tolerant.)

Any information on bobilina longevity would also be welcome, thanks.