Although the Melastomataceae are a very large family with many
attractive herbs and shrubs, the family has been largely overlooked
by horticulturists. That said, there have been some very notable
and well known exceptions - people interested in the cultivation
of melastomes should carefully consider the two species, Miconia
calvescens and Clidemia hirta, described on the invasives
page, and proceed with caution.
In terms of responsibly bringing species of melastomes into cultivation
in areas where there is any potential for their escape and introduction
into the local flora, it would be advisable to begin by considering
those species that occur naturally in your area. In localities
that lack native melastomes, you may wish to investigate nurseries
and botanical gardens. Try to ascertain whether a species is capable
of self-fertilization or not. If the plant can reproduce without
outcrossing and the climate is favorable, then there may be some
potential for invasive behavior. If the plant requires a pollinator
(most melastomes with attractive flowers do), try to find out
if any effective pollinators occur in your area.
In the southeastern United States, two melastomes are often used
in landscaping. Tetrazygia
bicolor, a beautiful shrub with large white flowers and yellow
stamens, is the northernmost member of the Miconieae with its
native range extending to the Miami, Florida area. Tibouchina
urvilleana is tolerant of a wider range of climactic conditions
and survives outdoors through mild winters. T. granulosa
is a similar, but larger species; neither is considered to have
any invasive potential.
Many other species that merit attention from horticulturists likely
would not survive outdoors in most areas north or south of 20
degrees latitude. They may, however, be grown in pots which can
be brought indoors for the winter. Alternatively, a great number
of species thrive in greenhouses, and, if kept in such an environment,
they pose no threat to the local flora. Some taxa that would make
excellent additions to a greenhouse include Charianthus alpinus,
Tetrazygia fadyenii, and several species of Meriania, Medinilla,
Melastoma, Blakea, Tibouchina, Topobea, and Brachyotum.
Being a rather unusual and largely overlooked family from the
standpoint of cultivation in greenhouses, little information is
available on propagation. Following are some comments about growing
melastomes.
From Ron Determan of the Atlanta Botanical Garden (where a number
of very attractive melastomes are in cultivation):
Melastomes are successfully grown in a potting mix also suitable
for growing ericads. The recipe:
1 part peat
2 fine orchid fir bark
2 fine treefern fiber
2 milled sphagnum (no damp off)
1 fine charcoal
now mix mostly:
2 fine bark
2 fine charcoal
2 milled sphagnum, and variations thereoff.
From Dan Skean - Break apart a mature or dried fruit and scatter
the seeds on sphagnum moss or moist vermiculite. The substrate
and seeds/seedlings should be kept inside of a terrarium with
high humidity. If algae develops on the vermiculite, use benylate
to kill it. According to Dan, it is very easy to get the seeds
to germinate and probably even grow most species to maturity (although
depending on conditions in the greenhouse, they may or may not
flower). Glassworks
Greenhouse in Ohio used to sell a rare species of large-flowered
Meriania that Dan gave them.
Solt, M. L. and J. J. Wurdack. 1980. Chromosome numbers in the
Melastomataceae. Phytologia 47(3): 199-220. "...Seed germination
and growth was best in a mixture of 3 parts bottomland loam, 3
parts peat, 1 part perlite, and 1 part sand; the mixture was overlain
by shredded sphagnum, damping-off thus being inhibited. Since
almost all the species sampled had quite small seeds, sowing was
directly on the moist sphagnum.
"Seedling germination was generally rapid (1-2weeks) in capsular-fruited
species, slower (1-2 months) in those with baccate fruits; the
longest germination time after sowing was 4 months for Mouriri
myrtilloides. Seedlings generally grew very slowly for several
months, but thereafter more rapidly. They were transplanted nto
flats and later into pots, using the above-mentioned soil mixture;
this mixture was rather acidic, only a very few melastomes being
calciphiles. All seedlings were grown under fluorescent lights
(16 hours per day) until about 20 cm tall, thereafter in daylight
on a sunporch or ( in the summer) in pots sunken in the ground
out of doors."