All will resprout during spring. However, if in doubt it is probably best not to let the compost dry out entirely. Bomareas form a growth point from which the stems and roots radiate. Some of the roots terminate in tubers, but unfortunately these appear to have negligible regenerative power. In due course, most plants will start to form rhizomes on which new growing points will form, and at that stage can be divided.
Flowers form as terminal clusters at the end of each stem from mature plants.
The two principal modes of propagation are from seed and by division. Most seem to be prepared to be self-pollinated, but as always it would probably be desirable to cross two different clones. The seed will take several months to ripen. Eventually when the capsules ripen, they split to reveal the seeds within. These are often almost as decorative as the flowers, as they can be brightly coloured.