Seed germination is also possible. The fruit of Baeckea species is a woody capsule, which is dehiscent at maturing. This makes seed collection difficult from plants in natural populations as the seed is small, and once released it is inconspicuous on the ground. Seed can be obtained by bagging green fruit and collecting the seed soon after it is shed. Alternatively, green fruit nearing maturity can be placed in open paper bags to collect the seeds as the fruit matures, or the seed can be dissected from the fruit.

The seed should be surface sown in spring or autumn in a greenhouse and keep the compost moist until germination takes place. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts.

https://www.anbg.gov.au/gnp/interns-2003/baeckia-gunniana.html