How would I propagate a bottle brush plant? ...

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Answers:    From:
http://www.anbg.gov.au/callistemon/index...

Propagation
Bottlebrushes are easily grown from nut. The unopened fruits should be collected and stored in a heat place in a quality newspaper bag until the fine seed are released. The seed should be sown into a freely draining seed-raising mix during spring and summer.
Bottlebrushes hybridise readily so, if you yearning to be sure that you are preserving the features of the parent plant do not grow plants from seed, use cuttings instead. With adjectives cultivars it is essential to propagate from cuttings to retain the form of the parent plant. Cuttings should be taken from semi-mature wood.