



- Hardiness: Moderate
- Light Needs: Medium
- Plant Structure: Stem
- Family: Hydrocharitaceae
- Genus: Blyxa
- Region: Asia
- Location: Tropical Asia
- Size: Height: 7-15cm (3-6in)
- Growth Rate: Medium
- Can Be Grown Emersed: No
Blyxa
japonica is an obligate aquatic plant often found in stagnant, shallow
pools and marshes as well as in slow moving, iron-rich forest streams in
tropical eastern Asia. It can also be found in man-made habitats (such
as rice paddies) throughout its range. It has become a staple in the
planted aquarium hobby due to its attractive grassy, hedge-like
appearance and should be easily obtainable from many internet retailers
or through trading.
This Blyxa species is not too difficult to
grow if its basic requirements are met: intense lighting in the 2-4
watts per gallon range, CO2 injection, and a fertilization regimen
including nitrate, phosphate, potassium, and micronutrient
supplementation. If conditions are to its liking and lighting is
intense, the leaves of B. japonica will develop golden and reddish hues
and the plants will exhibit more compact growth. If it does not receive
enough lighting, however, B. japonica will become taller, lankier, and
greener. This plant produces an impressive root system and appreciates a
nutritious substrate. If phosphate levels are kept high (1-2 ppm), this
species will continuously produce small white flowers on long, thin
stalks.
Despite its appearance, Blyxa japonica is actually a stem
plant growing on a densely foliated, short stem. Unlike other grassy
mid- to foreground plants, it is not nearly as invasive since it does
not produce long runners. Instead, it produces basal side shoots which
can easily be divided from the main plant with a sharp pair of scissors.
Replanting these side shoots can be a bit problematic as they are very
buoyant and tend to float. However, they take root quickly once in
place.
Blyxa japonica has recently been popularized by Takashi
Amano's 'Nature' layouts, where he utilizes its dense growth habit and
grass-like appearance to form attractive greenish to golden tussocks in
the midground. It forms an excellent contrast with small-leaved
foreground plants such as Glossostigma elatinoides in aquascapes lacking
taller plants.




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