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Gingers and Heliconia
for a
Tropical Effect |
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Reflections on Gingers
Gingers enjoy a special
position in the botanical kingdom with their elegance in form,
texture, sparkling color, and amazing symmetry. The word ginger
conjures up images of an exotic oriental food flavoring; however,
edible ginger (Zingiber officinale) is only one of approximately
1,300 species of the very diverse Zingiberaceae family. Gingers are
classed as a herbaceous perennial and have enjoyed popularity as an
ornamental plant in Asia and the Far East for centuries. Only
recently have they became known as outstanding ornamentals in the U.
S.
Gingers as a group add
outstanding foliage and exotic scented flowers to the landscape and
are wonderful plants for southern climates (Zones 8-10) depending on
species. Gingers also do well as indoor container plants. They are
heavy feeders and drinkers during the growing season. Most do best
in partial shade (no more than 4 hours of morning sun recommended),
but some thrive in full sun, others in full shade, depending on the
species. Many species enter dormancy in response to cool
temperatures and dry conditions. Rhizomes (the underground stem)
survive in dormant condition during such periods. During winter
periods when subjected to brief below freezing conditions, a heavy
top mulching helps ensure winter survival of the rhizomes as ground
freezing poses the major threat. If harsher conditions are expected,
it is best to dig up the rhizomes and store them in a warmer place
until danger has passed. Along the Houston Gulf coast, most gingers
can over-winter using these simple precautions. Cold tolerance or
lack thereof is species specific. Gingers and related plants may
be difficult to grow in Central Texas due to dryness and colder
winter conditions.
The Most Commonly Grown Ginger Genera
Kaempferia
rotunda - blooms appear before foliage. For a larger
view, click on picture.
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ALPINIAS – Called the "shell" gingers due to
the seashell form of the flowers. Come in all sizes from small to
large. Leaves are frequently fragrant. Most bear large clusters of
fragrant, stunning blooms. Like medium to full sun, Many can
overwinter without special care (except spp A. sanderae is tender
and needs protection). All make good pot plants. A. zerumbet
variegata is a boldly yellow streaked selection that adds
outstanding garden color and has become a favorite in the nursery
trade. This is the largest genus in the Zingiberaceae family
with over 150 species. Most bloom on second year growth so if
the plant freezes back, the bloom will be lost. Canes that have
bloomed should be removed after blooming. Alpinias can be
propagated by rhizome division in spring. They are native to
Southeast Asia, New Guinea, tropical Australia and Pacific
Islands.
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COSTUS -- The Costus family no longer belongs to the ginger family but is grown
along with them because of their similar growing requirements. Called "spiral"
gingers, they have true stems and spirally arranged foliage. Flowers attract
hummingbirds. Medium to full sun. Flower petals open from a cone on the terminus
of the stem. Depending on species, some get very tall, others are very short.
Costus speciosus and spiralis overwinter well in Houston. Other species may be
more tender. They can be propagated from rhizome division in spring and stem
cuttings. Costus are native to Central and South America.
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CURCUMAS -- Known as "hidden" gingers,
Curcumas are broad leafed plants with very colorful flowers which tend to be
hidden among the large textured foliage. The flowers are exotic, large and range
from white to pink to orange and shades of violet. Curcumas generally overwinter
well along the gulf coast but some species are very tender (e.g. some exotic
varieties from southeast Asia). There are spring and summer blooming types,
some produce bloom before foliage appears and others produce bloom after foliage
matures. Curcumas are native to Indomalaysia and China. They are easily
propagated from divisions and go dormant at the first cold wind of fall. They
range from 1 - 8 ft. in height.
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DICHORISANDRA - Not a true ginger but is
so similar, it is called ginger. It is a member of the Spiderwort family.
Arching stems are covered with deep green whirling leaves showing silver
variegation. This plant produces tight upright clusters of vibrant deep
violet-blue flowers in late summer and is root hardy in zone 9. You'd never know
it wasn't a ginger!! There is a straight and tall variety, D. thrysiflora, and
a pendulant variety, D. pendula.
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ELETTARIAS - Known as Cardamon ginger,
this plant produces a wonderful spicy aroma when leaves are brushed or torn. The
foliage is shiny green, upright and attractive in any garden. Although a tall
(5') plant, there is a dwarf form that stays less than 2 ft. Cardamons like
partial sun and are hardy into the 20 degree range. Flowers are attractive, but
infrequent.
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GLOBBAS -- These are small shade plants,
most 2 feet or less in height. All have attractive foliage and flowers which are
uniquely different from any other ginger. They resemble dancing ballerinas as
they hang in clusters. Globbas reseed rather rampantly and the most common
species are "bulbosa" with yellow blooms and "winitii" with yellow and purple
blooms. They go dormant at first sign of cold and are native to China and
Indomalaysia. They produce little white bulblets after blooming which drop and
produce new plants in abundance.
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HEDYCHIUMS -- Called "butterfly" gingers,
these are perhaps the easiest to overwinter and the showiest of flowering
gingers with clusters of butterfly shaped blooms on top of long stems which are
very fragrant. Some get very tall and others remain short depending on species.
This genus goes dormant after the first frost and enjoys medium to full sun.
They make large clusters so space is needed. Flower colors come in a broad
range, white, yellow, peach, pink, etc. H. cororonarium is a most popular white
fragrant bloom. Hedychiums can tolerate more sun than other gingers and bloom
on new growth. As canes bloom out, they should be cut to encourage new
growth. Hedychiums are propagated by division of rhizomes which spread rapidly
underground. This is the most hybridized of the gingers. They are native to
Madagascar, Indomalaysia, and southwest China.
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KAEMPFERIAS -- Called "peacock" gingers,
these are low growing plants with decorative patterned, often variegated
foliage. Perfect as a ground cover, especially in shade, many have purple,
lavender flowers sometimes mixed with white. Plants are dormant all winter
outdoors but make good house plants. K. rotunda produces blooms from the ground
before foliage appears. They are native to tropical Africa and Southeast Asia.
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ZINGIBERS -- Many species have large cones
hidden among the foliage that release thick juice when squeezed. The edible
ginger (Z. officinale) is a part of this genus. Most species make great foliage
plants, some with variegated foliage on tall stems. These can grow in medium to
full sun. They are also known as the Cone ginger or Soap Ginger and are native
to eastern Asia, Indomalaysia, and northern Australia.
- NOTE: This is not intended to be a complete list of
Gingers that might do well along the Gulf Coast area. Please check other
references as well for additional possibilities.
Other good sites you might want to visit for information
on Gingers include
Gingerwood or
All About Gingers.
Another good site to see representative pictures and
get information about various gingers is
Stokes Tropicals. This is a
commercial mail order site and we are not endorsing their products by referring
you there.
pinia zerumbet "variegata" with bloom
HELICONIAS -
A good companion plant for Gingers
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Did you know there are
three ground hardy tropical and exotic heliconias suitable for your Gulf
Coast Garden in Zone 9?
Pictured to the left is the
Heliconia rostata - dwarf form, known as the crab claw Heliconia.
Others include Heliconia
latispatha 'Schiedeana' (the most cold hardy to Zone 8 and a hybrid variety
- Heliconia (H.psitt. x H. spath.) known as the Golden Torch Heliconia
These Heliconias need a
freeze free winter (18 months of no dieback) in order to bloom but are root
hardy in colder winters in Zone 9.
Consider growing some of
these varieties along with your taller gingers to add variety to your
colorful "Tropical Look" garden. |
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