Acorus gramineus 'Variegatus' Care Guide
Acorus gramineus 'Variegatus' is a slow grass-like sweet flag for paludariums and pond margins, usually grown emersed.
Compiled by Aquairi from published sources · Published · Updated
Overview
Acorus gramineus 'Variegatus' is a variegated form of the Japanese sweet flag, recognised by white-and-green grass-like leaves. The species is native to Japan, Korea and eastern Asia, where it grows in wetlands and shallow water. It is most often grown emersed in paludariums and along pond margins, though it can tolerate fully or partially submerged conditions.
Taxonomy
- Family: Acoraceae
- Genus: Acorus
- Scientific name: Acorus gramineus 'Variegatus'
- Common synonyms: Variegated Japanese Sweet Flag
Habitat
In the wild the species occupies wetlands and the edges of streams and ponds. It spreads by rhizome, forming a near-seamless groundcover where conditions suit it. The plant has long, narrow, slightly curved grass-like leaves and reaches about 30 cm in height. Flowering typically requires at least partial submersion.
Tank requirements
- Placement: background / margin, emersed growth preferred
- Temperature: 10-24 °C (50-75 °F)
- pH: 6.0-8.0
- GH: 4-18 °dGH
- Lighting: medium
- CO2: not required
- Mature height: up to about 30 cm
Growth and propagation
This is a slow-growing rhizome plant. It is propagated by dividing the fleshy rhizome and planting the base in shallow water. It is frequently used around the edges of ponds and water gardens, and is sometimes sold for freshwater aquaria, though it performs best when grown emersed.
Propagating Acorus gramineus 'Variegatus' by Rhizome Division
Overview
Acorus gramineus 'Variegatus' is the yellow-streaked, longer-leaved variegated form of Japanese sweet flag, native to Japan, Korea and eastern Asia. Leaves are long and narrow, reaching about 30 cm. It is a marginal wetland plant that can grow fully or partially submerged or in very moist soil, but it usually only flowers when at least partially submerged. It is commonly used around the edges of ponds and water gardens.
Propagation Method
Acorus gramineus spreads aggressively by rhizome, creating a nearly seamless groundcover where conditions suit it. It is propagated by dividing the fleshy rhizome and planting each base in shallow water or wet soil, which is also the way to keep the variegated leaf colouring true.
Step-by-Step
- Lift an established clump from its pot, basket or pond margin.
- Rinse the fleshy rhizome so you can see the growing points.
- Divide the rhizome into sections, each with roots and a fan of leaves.
- Plant each base in shallow water or constantly moist soil at the pond edge or in a paludarium.
- Keep it wet and brightly lit while new leaves establish.
Conditions for Healthy Growth
- Shallow water or very moist soil at a pond margin or in a paludarium.
- Bright light, with cool to subtropical temperatures.
- Grown emergent for best long-term health; full submersion is only short-term.
- Tolerates a broad pH range and ordinary substrates.
Maintenance
Growth is slow, so it stays tidy and rarely needs hard pruning. Lift and divide congested clumps every couple of years to renew vigour and produce new plants. If you have tried it submersed in an aquarium, move it to an emergent position before the leaves begin to soften and rot.
Common Challenges
- Slow, gradual rotting when kept permanently submerged underwater.
- Variegation can dull in low light; give it bright conditions.
- Aggressive rhizome spread at a pond margin if left unchecked.
- Slow recovery from division, so divisions take time to bulk up.