Cryptocoryne Blassii care guide
Cryptocoryne Blassii (Cryptocoryne cordata var. blassii) — low light, 22-28 °C, pH 6-7.5, no CO2.
Overview
Cryptocoryne Blassii (Cryptocoryne cordata var. blassii) is an aquatic plant of the family Araceae, listed in the Aquairi knowledge base as an intermediate-level species. It is typically grown under low light and without obligatory CO2 injection on nutrient-rich aquasoil. A rare and beautiful Cryptocoryne with dark olive-green upper surfaces and rich purple-red undersides. Slow-growing but extremely decorative once established, valued by collectors.
Taxonomy
- Family: Araceae
- Genus: Cryptocoryne
- Scientific name: Cryptocoryne cordata var. blassii
- Common synonyms: Blass's Crypt
Habitat
Cryptocoryne species inhabit slow-flowing forest streams, peat-swamp creeks and seasonally flooded lowlands across South and South-East Asia. Most grow rooted in soft, mineral or organic sediments under partial shade. In the Aquairi knowledge base, populations associated with this form are recorded from Thailand.
Growth requirements
- Lighting: low
- CO2: not required
- Temperature: 22-28 °C (72-82 °F)
- pH: 6-7.5
- GH: 3-12 °dGH
- Substrate: nutrient-rich aquasoil
- Maximum height: 25 cm
- Growth rate: slow
- Recommended placement: midground
Placement
Planted into a nutrient-rich substrate; emersed-grown stock often melts after submersion and re-grows new submersed leaves within weeks. Stable parameters minimise repeated melt. In the Aquairi knowledge base this form is recommended for the midground under low light and without obligatory CO2 injection, using nutrient-rich aquasoil.
Propagation
Spreads vegetatively by runners that form daughter plants on the substrate; clumps are divided once the colony has filled the area. Documented propagation techniques for this entry include: horizontal runners.
Common issues
Sudden parameter shifts — particularly drops in temperature or large water changes — trigger so-called Crypt melt, in which existing leaves dissolve while the rhizome regrows new ones. Stable conditions and steady CO2 prevent repeat events.