With such a large and diverse group of plants which inhabit most climatic niches, it is not possible to give more than a brief and fairly superficial guide to some of the more commonly seen genera and species. The wide distribution of the Leptospermum Alliance also means that problems may be experienced when trying to grow a species in a different climate to that of its natural habitat. As a general guide:
Despite these cautions, a number of species have proven to be adaptable in seemingly unsuitable climates. For example, the western species M.fulgens, M.nesophila, M.lateritia, M.diosmifolia and M.huegelii are grown very successfully in coastal areas of New South Wales and Queensland while the tropical species M.viridiflora will grow successfully in colder districts if it is protected from frost when young. The two western Callistemon species are also successful in many east coast areas and even spectacular western Kunzea such as K.baxteri and K.pulchella can be grown successfully in the south-east. However, when selecting plants for the garden it is always worth considering the natural distribution of the species and, if in doubt about the suitability of the plant, seek advice from local specialist nurseries.
Some of the plants in the Leptospermum Alliance, particularly Melaleuca and Callistemon, can be found in nature in poorly drained areas. A few, including Melaleuca quinquenervia and M.linariifolia are found in locations where their roots are either permanently or seasonally subject to innundation. As a general rule, however, most plants in this group will perform best in medium to light soils (eg. sandy loam) that are well drained but which retain some moisture. Most require a sunny or lightly shaded position for best flowering.
|Left: Members of the Leptospermum Alliance usually respond well to severe pruning.
Right: Sawfly larvae on the foliage of Callistemon citrinus. Photos: Brian Walters
Most species respond favourably to a light annual trim to promote bushy growth and the more robust growers will even respond to severe pruning if absolutely necessary. However, pruning those species which have a weeping growth habit can destroy their shape (eg.C.viminalis and its cultivars such as "Hannah Ray" and "Dawson River").
There are few pests that cause serious problems with this group of plants except that western species may be sensitive to root rot fungus (Phytophora sp.), which is one reason why they can be difficult to grow under humid summer conditions.
Other pests that can be troublesome are:
|Right: Scale insects. Right: Webbing Caterpillar. Photos: Brian Walters and Ben Walcott|
Species in the Leptospermum Alliance are fairly tolerant of fertilisers, unlike some other genera of Australian plants. The use of a slow release fertiliser after flowering will usually be sufficient.