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Utricularia alpina, or the Alpine Bladderworts grows
mainly as an epiphyte in the wild. Utricularia are found
growing in moss, bark, or decaying leaves on cliffs,
hillsides, and fog forests in the Caribbean, Central and
South America. The plant can reach 40 cm hight. Quite
easy to grow.
The leaves are elliptical 5 to 20 cm long. They are
generally grown for their spectacular flowers that can
put orchids to shame. The short flowering stalk produces
up to four large white flowers with yellow plates up to 4
cm in diameter. Flower easily. It grows year around
without visible dormancy.
The bladder-trap is unique to the Utricularia, giving
them their nickname of Bladderworts. Utricularia has no
true root system. They form creeping or floating, thin,
hair-like stems that extended away from the main body of
the plant. The bladder-traps are held on these stems.
Most of the traps are underground and are too small to
hand feed. So, it has to catch it's own microscopic prey.
Thin, filament-like hairs protrude from the trap door.
These serve as guides to send the prey toward the door.
These plants use low pressure inside the chamber vs. high
pressure outside. When a bug activates the hairs, the
door opens quickly, forcing the victim into the low-pressure
digestion area. The water is pumped out and the mulcilage
seal is re-established. The plant now secrets digestive
juices to break down the captured prey and absorb the
mineral rich fluid. Trapping usually occurs within 1/50
of a second. It is believed that glands found around the
closed entry may also secrete an attractant that may aid
in luring prey.
Hardiness zone 11, (4°C/40°F) in Winter. This plant is
grown in pure live sphagnum, you can also use one part
live sphagnum moss for one part perlite. Grow in bright
to diffused light with a temperature of 15-20°C in
Winter and 20-35 °C in Summer. Utricularia make
excellent additions to any terrarium or bright window
sill. Epiphytic Utricularia prefer frequent overhead
watering, at least once a day in Summer, and once every
few days in Winter. To overcome dry periods, some of the
species such as Utricularia Alpina, have tubes in which
they are able to store moisture. Like other carnivorous
plants, they do require pure water and can be killed by
fertilizer in the soil.
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