Rotala sp. spikey
Aquarium suitability: yes
Light: medium to high
Temperature tolerance: 4 to 32 °C
Optimum temperature: 22 to 28 °C
Carbonate hardness: 0 to 21 °dKH
pH value: 4.5 to 7.5
Carbon dioxide (CO2): 20 to 40 mg/l
Nitrate (NO3-): 10 to 50 mg/l
Phosphate (PO43-): 0.1 to 3 mg/l
Potassium (K+): 5 to 30 mg/l
Iron (Fe): 0.01 to 0.5 mg/l
Can grow emersed?: yes
Suited for outdoor cultivation / ponds: yes
Rotala sp. spikey is a delicate fine-leaved plant originating from Taiwan.
R. sp. "spikey" is well-established in aquaristics and can be obtained in trade quite easily. This Rotala was originally introduced under the erroneous name "Mayaca sellowiana", which is the reason why many people assume that this name is a synonym of R. sp. "spikey". This is incorrect, though, as true Mayaca sellowiana might look somewhat similar, but is a totally different plant species that has nothing to do with the genus Rotala.
The submersed very narrow-lineal leaves of Rotala sp. "spikey" grow in whorls and are of a light green to reddish colour. They grow to a length of 1.5-2 cm and a width of 0.5-1 mm. The number of leaves per node varies from 3 to 6. The leaf tips are truncate and sometimes have two points, like in many other fine-leaved Rotala species. The stem is green.
The emersed form of R. sp. "spikey" has a creeping habit. Some of the stems also grow upwards, and there are 2 to 4 leaves per node. The emersed leaves have a very short stalk and are elliptic to lanceolate, 0.5 to 1 cm long and 2 to 4 mm wide. Emersed plants may develop small flowers with only 1 mm large light purple petals in their leaf axils.
Like R. wallichii, which is a little more difficult in cultivation, R. sp. "spikey" prefers soft water rich in CO2. Unhindered light and ample iron are important for the shoot tips to attain an intense reddish colour. Constant, well-planned fertilization is crucial to prevent stunted growth and blackening. The plant may have some requirements, but it is not especially difficult in cultivation.
Sometimes the growing shoot tips develop an overhanging habit, which is an interesting design feature. A large group behind some Cryptocorynes or hardscape is a beautiful eye catcher. In order to further more compact growth, groups may be trimmed back. Then, a large number of lateral shoots will form.
Rotala sp. "spikey" is a great plant for small tanks.
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