This supplement is
additional information to the following article as seen
in Issue Six:
Your Guide To Gardening
In Cyclone Areas (pp. 26-31)
...for more about palms for cyclone areas &
less resilient plant types.
by Anton van der Schans MAIH, Landscape Architect –
Cairns
Feather Palms
Most Palms with sparse crowns of light fronds do little
damage when they shed their fronds, and their slender
trunks provide great flexibility.
Coconut palm (Cocos nucifera) is perhaps the most resilient
of all tall plants, taking the full brunt of onshore
gusts and surviving inundation by the sea during tidal
surges. They do need to be denutted regularly lest these
become potentially lethal missiles and remember that
old specimens can attain dizzying heights and will eventually
topple over.
Hurricane / princess palm (Dictyosperma alba)
is appropriately named as it tolerates coastal exposure
in its Mauritius habitat, and makes a reasonable (though
less tolerant of front line salt) and compact coconut
substitute.
Alexandra palm (Archontophoenix alexandrae)
and black plam (Normanbya normanbyi) from N.E. Qld,
as well as Gulubia costata from Cape York, and the Darwin
palm (Carpentaria acuminata) from the Top End,
are native feather palms typically occurring in palm
swamp communities, with dense fibrous root systems well
anchored in boggy soils. Gulubia in its habitat often
develops picturesque leaning trunks and with its crown
of large drooping fronds could make a graceful, safe
substitute for the Coconut as its fruit are only tiny.
Foxtail palm (Wodyetia bifurcata) occurs on
exposed rocky hillsides near the coast on Cape York
Peninsula and appears to withstand cyclones.
Cuban royal palm (Roystonea regia) occurs in
swampy areas around the Caribbean, surviving their frequent
hurricanes by allowing their fronds to shear off at
the crownshaft. These can do some damage, so this palm
needs to be given some space, which its grand scale
demands visually anyway.
Palms with top-heavy canopies
Fishtail palms (Caryota urens – and other
single trunked species such as. C. no, C.
maxima, C. rumphiana, etc.) and to a lesser
extent the clumping Caryota mitis. These palms
have dense canopies that seem pre-ordained to act as
sails, but fortunately their scruffy appearance has
also made them unpopular in more recent decades.
Fan Palms (Livistona decipiens, Corypha
utan and Bismarkia nobilis) are typically
less cyclone resistant than feather palms, however many
specimens withstood cyclone Larry, such that they should
still be considered for planting clear of structures.
Fiji fan palm (Pritchardia pacifica) does
appear to be very wind resistant, and seems to need
a coastal site in the tropics exposed to breezy salt
air to remain free of a disfiguring leaf fungus.
Cairns fan palm (Livistona muelleri) is native
from Cairns through to Cape York in open woodland often
in big groves on the worst white clay soils. It is slow
growing, takes fire, flooding or drought, remaining
small for decades with a compact crown of stiff, glaucous
fronds complimenting Pritchardia.
Sabal palmetto, Thrinax spp. and
other genera from the Caribbean appear to be tough resilient,
often small to moderate palms that should also appeal
to palm collectors keen to source them from specialist
nurseries.
Less resilient plant types
Bamboos – Generally all the taller clumping types
have a very compact fibrous root system that usually
lifts in one piece as the whole clump topples over (but
by cutting after the weight off the top will often flip
back into the hole it left).
Many of the tropical clumping bamboos are rainforest
edge plants, so can still be suitable in large gardens
planted with sturdy shelterbelt trees.
Only grow clumping forms of bamboo. Running bamboos
are undesirable. Better choices are some of the shorter,
shrubby clumping bamboos such as hedge / fairy bamboo
(Bambusa multiplex cultivars) and tiger grass (Thysanolaena
maxima) which even in the worst case can do no real
damage and are easily cleaned up.
Fast growing, brittle soft-wooded trees with
top-heavy canopies
African tulip (Spathodea campanulata)
often beguiles newcomers to the tropics with its vivid
vermillion blooms; however it is equally renowned for
its brittle, unstable manners and weedy proliferation
along disturbed rainforest edges. The yellow flowered
form is potentially just as unacceptable.
Brazilian fern tree/tower tree (Schizolobium parahyba)
was once (and deservedly) very popular for its dramatic
rapid growth, frond like leaves and spectacular flower
display, however it becomes very tall with surface roots
mainly in the topsoil layer and more often than not
keels over. Despite these faults, if you have enough
room well away from structures, and preferably deep
well drained soil, then you might consider planting
it.
Golden bouquet (Deplanchea tetraphylla) is
unfortunately fast growing with big leaves that catch
the wind, and is often left with a ragged broken canopy.
It is still worth having in larger gardens away from
the home in a mixed tree planting for its enormous flowerheads
dripping with nectar.
Gum trees (Eucalyptus/Corymbia spp.),
regrettably these iconic Australian trees can be brittle,
dropping large limbs or toppling, their root systems
are also sensitive to the inevitable disturbance caused
by adjacent construction of houses etc.; such that it
is better to avoid planting close to homes. However
there are exceptions: Moreton Bay ash (Corymbia
tessellaris) which occurs along much of the Queensland
coast and its hinterland is generally very sound, dropping
few branches with the advantage throughout the year
of finer, less messy bark, twig and leaf litter.
Swamp bloodwood (Corymbia ptychocarpa) is
a small to medium tree from the Top End that suits heavy
soils and usually only suffers minor damage and could
be safely recommended for most gardens, its huge nectar
rich flowers are a big bonus.
Yellow poinciana (Peltophorum pterocarpum)
a popular medium sized tree with a brittle structure
which rapidly collapses during widy weather.
MAIN
|
TOP
|