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Cryptocoryne crispatula var. tonkinensis
Cryptocoryne crispatula var. tonkinensis
Cryptocoryne crispatula var. tonkinensis is a rare and delicate plant with thin, extremely narrow leaves. Slow growth, ideal for creating texture contrast.
Class:Liliopsida
Order:Alismatales
Family:Araceae
Genus:Cryptocoryne
Species:Cryptocoryne crispatula var. tonkinensis
Formerly known as:
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Water Temperature
8 - 30 °C
pH Value
6 - 9
Water type
Freshwater
Light
Low to High
CO2
Low - High
Expected height
30 cm
Expected width
10 cm
KH
5 - 21 dKH
Species description
Geographical Origin and Habitat: This rarity originates from the limestone regions of northern Vietnam (Tonkin) and southern China. It grows predominantly along the sandy and muddy banks of rivers and streams flowing over limestone substrates. During the monsoon season, it is completely submerged by strong currents, while in the dry season, it lives in emersed muddy and wet soils under the shade of riparian vegetation.
Taxonomy & Genetics: It belongs to the Araceae family, genus Cryptocoryne. It is one of the thinnest and most distinct varieties within the Cryptocoryne crispatula complex. Genetically, it is closely related to var. balansae and var. flaccidifolia, but has evolved in isolation, developing exceptionally narrow leaves and a more graceful build adapted to strong water currents.
Physical Structure: It forms dense and compact rosettes from which very narrow filiform leaves develop, measuring 20 to 40 cm in length and only 2-5 millimeters in width. The stem is reduced to a short, woody rhizome that produces a well-developed fibrous root system to firmly anchor the plant in sandy alluvial substrates.
Color & Texture: The leaves have slightly wavy linear margins and a coloration ranging from olive green to bronze brown, depending on light intensity and nutrient supply. The texture is smooth or finely wrinkled along the prominent central vein. This thin, grass-like leaf structure gives the plant an elegant, grassy appearance unique among Cryptocorynes.
Care, breeding and tankmates
Lighting & CO2: Prefers moderate to high lighting; under weak light, the internodes tend to weaken and the leaves lose their bronze coloration. Carbon dioxide injection is recommended to support the plant's slow metabolism, ensuring more consistent development and bushier leaves.
Nutrition & Substrate: A nutrient-rich substrate is vital. It requires steady dosing of iron and other trace elements in the substrate (via root tabs). It also responds positively to balanced liquid column fertilization to absorb remaining elements.
Water Chemistry: Since it lives in limestone beds in nature, it tolerates or prefers water of medium hardness, with a KH of 3 to 12 dKH and a neutral to slightly alkaline pH (6.8-7.8). The ideal cultivation temperature ranges from 20°C to 28°C.
Space Management & Placement: Great for the midground or background in nano or medium-sized aquariums. Its grass-like appearance allows it to be planted in dense groups, creating a tall grass-like layout or a grassy focal point that contrasts beautifully with broad-leaved plants.
Pruning: Only requires the periodic removal of damaged older leaves, which should be gently detached at the base of the crown. Avoid topping them in half as the cut ends would rot.
Risks & Diseases: It is highly sensitive to "Cryptocoryne melt." Any temperature spikes, massive light changes, or chemical parameter shifts can trigger leaf decay. Stability is recommended, and it should not be moved after rooting.
Geographic Origin and Distribution
This rarity originates from the limestone regions of northern Vietnam (Tonkin) and southern China. It grows predominantly along the sandy and muddy banks of rivers and streams flowing over limestone substrates. During the monsoon season, it is completely submerged by strong currents, while in the dry season, it lives in emersed muddy and wet soils under the shade of riparian vegetation.
Origin
South and Southeast AsiaEast Asia
Plant profile
- Placement
- No verified data available
- Botanical form
- No verified data available
- Growth
- No verified data available
- Substrate
- No verified data available
- Column fertilization
- No verified data available
- Root fertilization
- No verified data available
- Trimming
- No verified data available
- Propagation
- No verified data available
- Nutrients
- No verified data available
- Sensitivity
- No verified data available
- Layout role
- No verified data available
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
