Cryptocoryne wendtii 'Red' (red Wendt's Crypt) care

Light

The Goldilocks zone. Not the south-facing windowsill (too hot, too direct), not the back of the room (too dim, growth stalls). Develops the strongest red-bronze colour under moderate to bright aquarium lighting (around 40-60 PAR). It still survives in low light but stays greener and grows more slowly there. If you can't decide, a free phone lux-meter app aimed at the leaf at noon should read between 800 and 1,500 lux.

Watering

Watering cryptocoryne wendtii 'red': continuously submerged; 25-50% water change weekly. The number that matters isn't the day of the week — it's how dry the top 2-3 cm of the pot feels. A finger in the soil tells you more than a watering app. After every watering, tip the saucer. Kept permanently underwater. Maintain stable parameters with a 25-50% weekly water change; abrupt shifts in temperature, pH or hardness can trigger crypt melt as the plant re-acclimatises.

Soil and pot

Cryptocoryne wendtii 'Red' grows best in nutrient-rich aquarium substrate. A strong root feeder. Use a nutrient-rich planted substrate or gravel/sand supplemented with root tabs. Plant roots into the substrate, keeping the crown and growing point exposed. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Cryptocoryne wendtii 'Red' sits happiest at around 100% (submerged) humidity and 22-28°C (72-82°F). Submerged culture makes air humidity irrelevant. For emersed propagation, keep the air near saturated (90-100%) under a cover so leaves don't dry out. If you keep the room above 22 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed cryptocoryne wendtii 'red' sparingly. Feed mainly at the roots with substrate tabs every 2-3 months; redder colour responds well to iron, so add a chelated-iron liquid fertiliser. Moderate CO2 boosts growth and intensifies the red pigmentation but is optional in low-tech setups. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on cryptocoryne wendtii 'red' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Crypt melt — Leaves dissolve after replanting or water-chemistry changes. Leave the rhizome in place; fresh submerged growth returns once conditions stabilise.
• Loss of red colour — Greens out in dim light or low iron. Raise light moderately and dose chelated iron to restore the red-bronze tones.
• Algae buildup — Slow growth under excess light allows algae on older leaves; balance light, nutrients and CO2 and prune affected leaves.
• Slow establishment — Newly planted Crypts often pause for weeks. Be patient and avoid moving them while roots anchor.

Propagation

Separate rooted daughter plants from runners once they have a few leaves and replant in substrate. Emersed flowering and seed are possible but rarely used; runner division is standard. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Cryptocoryne wendtii 'Red' is mildly toxic to pets. Not individually listed by the ASPCA, so the status is undetermined; treat with caution and verify with a vet. As a Cryptocoryne (family Araceae), tissues hold insoluble calcium oxalate crystals; an inquisitive cat or dog chewing emersed foliage may show oral irritation, drooling or GI upset. Never assert pet-safe without ASPCA grounding. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Cryptocoryne wendtii 'Red' deep-dive guides

Every aspect of cryptocoryne wendtii 'red' care, each with its own calibrated guide:

• Cryptocoryne wendtii 'Red' watering schedule
• Cryptocoryne wendtii 'Red' light requirements
• Best soil mix for cryptocoryne wendtii 'red'
• Cryptocoryne wendtii 'Red' fertilizing guide
• When to repot cryptocoryne wendtii 'red'
• How to propagate cryptocoryne wendtii 'red'
• Cryptocoryne wendtii 'Red' growth rate & size
• Cryptocoryne wendtii 'Red' cold hardiness
• Cryptocoryne wendtii 'Red' temperature & humidity
• Is cryptocoryne wendtii 'red' toxic to cats & dogs?
• Is cryptocoryne wendtii 'red' toxic to cats?
• Is cryptocoryne wendtii 'red' toxic to dogs?

Featured in these plant shortlists

Cryptocoryne wendtii 'Red' qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Cryptocoryne wendtii 'Red' is also commonly called red Wendt's Crypt or wendtii red.

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