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Your Garden
The Premier
Gardeners
Guide
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Terrariums
Constructing a
terrarium is easy,
inexpensive and can be accomplished in a single afternoon. Terrariums are closed glass or
transparent plastic containers used to create a 'mini environment' for
plants. The principle behind a terrarium is simple. The water from the
soil is taken up into the plant as it grows. The water is then released
through the leaves via transpiration. This water condenses on the glass
and runs back to the soil where it can be used again.
Because this mini
water cycle occurs inside the sealed terrarium, the plants can go for
months without watering. It also creates a jungle-like atmosphere of
high humidity, warm temperatures and no drafts, which are perfect
conditions for many of the tropic-native houseplants common today.
History of Terrariums
The history of terrariums is rooted in the Victorian age. They were
used in parlors to contain many delicate and exotic plants. Despite the
fact terrariums have been around for many years, they have never
returned to the popularity of 1850's.
Getting Started
Assembling and planting a terrarium is easy. Start with a clean, dry
container. Terrariums or glass cases can be purchased at many stores,
but an old 10-gallon fish tank, a large glass jar, or a large glass
bowl with a beveled glass lid could work just as well. Since terrariums
don't have drainage holes, place a 2-inch layer of gravel, pebbles or
perlite on the bottom of the container to insure good drainage. Next
add a one-fourth inch layer of charcoal. The charcoal aids drainage and
helps control soil odors. Finally, add one to four inches of light,
well-drained potting soil. As you are adding the soil, create hills and
valleys to add interest.
Choosing the Perfect Plants
The next step is selecting your plants. Plants with slow growth rates,
tolerance of high humidity and small leaves make good candidates for
terrariums. A general rule of thumb when designing a terrarium is to
choose an upright growing plant, a trailing plant and a plant of
intermediate size.
A terrarium is not the place for philodendron and
spider plant. Instead, use this special environment to grow plants that
are exotic and could not live on your windowsill, such as net plant,
creeping moss and ferns. Flowering plants such as miniature African
violets and carnivorous plants such as pitcher plants and venus fly
traps make beautiful and fun additions to terrariums. In fact, the
humid environment is good for any houseplant except cacti and
succulents, which suffer in a humid environment.
Planting and Finishing Touches
To plant a terrarium, simply remove the plant from the pot, gently
shake off excess soil and place in the soil inside the terrarium. Rocks
and stones make good additions to your miniature landscape.
Small
shells, small figures, toy dinosaurs or other similar items can also be
added for a touch of fun. The options are limited only by your
imagination; just remember not to incorporate wood. Sometimes,
driftwood or similar wood products could introduce unwanted insects and
fungi, which will thrive in a terrarium's humid environment.
Watering and Care
To finish your terrarium, moisten the soil by misting heavily or using
a rubber bulb sprinkler. Soil stuck to the glass from planting can be
rinsed off by lightly running water down the glass. After watering,
cover with a piece of beveled glass or saran wrap.
Place the terrarium
in medium to bright, indirect sunlight. An east or north window would
be a good choice. Fertilizer should not be used, because it will
encourage growth and earlier crowding of the plants. If excessive
condensation builds up on the glass, uncover the terrarium until some
of the condensation evaporates; then replace the cover.
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