The fruits contain hard, waxy seeds which are expelled over a wide area when ripe. The following diagram of an Eriostemon flower shows some of the features which can be observed in the Boronia group as a whole. A feature of most of the group is the presence of aromatic oils in the foliage and, in some cases, the flowers. When crushed or brushed against, the foliage gives off quite a strong aroma. Table 2 lists some of the features of each genus.
Some variations often occur, such as the number of petals.
Propagation Propagation of the Boronia group of plants from seed is usually difficult and propagation by cuttings is the preferred method. This also enables plants with desirable characteristics of form or flower colour to be perpetuated. Some work has been carried out on propagation by grafting. Some research has been carried out into ways of overcoming this dormancy with a degree of success being achieved. For example, it was found some years ago that placing seed of Eriostemon australasius in a muslin bag in running water for up to 2 weeks seemed to leach out the inhibitory agent, allowing germination to proceed.