Propagating Cryptocoryne wendtii 'Mi Oya'

Propagate the Sri Lankan locality form Cryptocoryne wendtii 'Mi Oya' from runners and rhizome division, handle crypt melt, and deepen its reddish-brown color with light and rich substrate.

Overview

'Mi Oya' is a locality form of Cryptocoryne wendtii (family Araceae) named after the Mi Oya river in Sri Lanka where it is found. It has reddish-brown bullate leaves and is a tolerant, reliable midground plant. Like every crypt it is a rosette growing from a central rhizome and a root feeder, so it is propagated from runners and rhizome division rather than by topping cuttings.

Propagation Method (Runners / Division)

Two crypt methods apply. Runners (stolons): the mother plant sends daughter plants on runners under the substrate, all attached to it. Rhizome division: lift an older clump and cut the rhizome so each piece keeps roots and leaves; many tiny plants can also sprout from a cut rhizome.

Runners (stolons) — daughter plantlets emerge from runners beneath the substrate
Rhizome division — split a mature clump along a natural crease between rosettes

Step-by-Step

Let the mother establish and send daughter plantlets along its runners.
Wait for a daughter to reach medium size (leaves about 5–6 cm); they grow faster while attached to the mother.
Cut the runner to free the daughter, keeping its roots intact.
To divide, lift an older clump, find a natural crease between rosettes, snip with sharp scissors, and gently untangle the roots.
Trim long roots and replant each piece in nutrient-rich substrate with the crown above the soil.

Conditions for Healthy Growth

'Mi Oya' is undemanding and grows at 22–28 °C without CO2, but its reddish-brown color intensifies under stronger light and on a quality, nutrient-rich substrate. As a root feeder it appreciates root tabs. It grows slowly as a dependable midground clump.

Maintenance

Periodically thin the clump by lifting and dividing crowded rhizomes, and refresh root tabs so daughter plants keep emerging. With adequate light and nutrients an established plant can send out a couple of new runners per month.

Common Challenges

Freshly divided pieces are most likely to melt, so divide less often and keep parameters stable. The rhizome stays alive, and the reddish-brown leaves regrow once the plant has acclimated.