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strand of
it and do not collect all the
cuttings (even the small ones), they will
move around in water until they snag
somewhere and start new growth. With ferns, you can find new
plants in unexpected places. |
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Another group of rosette plants comprises the many
Echinodorus
species, many of which form large rosettes (E. bleheri), while others
have small rosettes but a lot of runners (E. anugustofolius). The latter
can be trimmed like the Cryptocorynes by cutting away runners and
removing some of the rosettes.
The larger rosettes, such as E. bleheri,
can be trimmed in two ways. The first is by trimming away leaves as
close to the base as possible.
This is best done by grabbing an outer
stem as close to the rosette as possible, and gently peeling and pulling
the stem from the rosette; the new leaves grow from the center of the
rosette, and the older leaves are at the periphery of the rosette. Some Echinodorus
like Amazon sword (E. bleheri), E. ozelot
or E. “Rose” will form a second rosette next to the first.
Stems are the easiest
plants to trim and replant. Ludwigia, Rotala,
Hygrophila or one of the many other stem plants will grow planted or
floating, can send out roots from any node along the stem where leaves
form, and can be cut anywhere along the stem and reused.
When you crop a stem, many
stems will develop two stems at the node below the cut, so judicious
cropping is a way to help a stand of long stems develop a bushier
appearance.
Stem plants can grow roots from the leaf nodes, and you can use this
to your advantage when first starting a stand of stems. You can place a
stem horizontally along the substrate, anchoring it in a few places or
burying it in several places along the horizontal length.
Healthy Plants Require Balanced Growing
conditions. An unbalanced planted aquarium need a high level of
lighting without adding carbon dioxide.
Water Hardness, black
or red algae affect your aquarium. Some sword plants growing from a riverbed that was pure calcium
carbonate--yet, the swords were
flourishing.
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Some plants grow leaves from a central base. Such rosette plants
include the genus Cryptocoryne wentii The strong roots can grow into a
dense mass, requiring a sharp knife to divide plants. |
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Some rosette-type
plants, including Cryptocoryne species, spread by sending out runners
(like long, thick lateral roots) above or just below the substrate. Cryptocoryne
are somewhat slow growing, the larger the piece you trim,
the better suited it will be for reuse. These plants develop a sturdy
rhizome as they mature.Baby plants
start growing at the end of the runner, and that plant
then sends out another runner. Once a new plant is growing on a runner
and has several leaves, you can snip the runner to divide the plants.
You can leave these plants in place or replant them.
If the plants are growing too closely together for you to be able
to pick out individual rosettes, you might have to cut away at the
roots that have meshed with neighbors. A portion of root base with a
half dozen or so leaves usually is adequate for growing a “plant.”
You can thin out
a stand of Cryptocoryne
by cutting away some of the stems at or near the substrate. If you can,
try pulling away a few plants from the others – this will sometimes
result in less damage to the roots.
A small amount
of such thinning on a robust Cryptocoryne will not
harm it. Unlike the ferns, these cut leaves will die and cannot be
reused. Also, on a smaller plant, a Cryptocoryne might respond to leaf
cutting by letting its remaining leaves rapidly deteriorate (Cryptocoryne
meltdown).
After storing up nutrients for a while,
the plant base will begin growing new stems and leaves. A better method
is to cut away a length of a root with a sharp blade. The cutting can be
replanted.
In taller aquaria, a
stem plant will sometimes look nice closer to the light, but be pale,
less leafy or even profuse with bare roots along the stem closer to, but
above, the substrate. This is the result of stems shading their lower
portions from the light.
Do Planted Tanks Require CO2?
Beautiful aquatic
plants growth depends on lighting. With low to moderate lighting, adding CO2 is not
necessary.
Freshwater Java fern
(Microsorum pteropus) can suffer from Java fern
melt if blue-green algae is present due to nutrient
deficiencies.
CO2 is only a problem for fishes
if you add too much to the water. A good
level for plants is about 20 to 30 ppm. CO2 doesn't stress fishes until the level gets to be about 50 ppm
(parts per million).
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