Red Cabomba (Forked Cabomba) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Demands high to very high aquarium lighting (PAR 80-150+) to sustain red pigmentation. Under moderate light the plant reverts to green and declines. A 10-12-hour photoperiod with high-output full-spectrum LEDs is essential. If your only bright window faces south, that's perfect for red cabomba — same window any aroid would fry on.

Watering

Watering red cabomba: fully submerged aquatic; maintain in aquarium water continuously. 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. Requires warm, very soft, acidic water: temperature 24-28°C, pH 5.5-6.8, GH below 5. CO2 injection at 25-35 ppm is strongly recommended. This species is sensitive to hard water and alkaline conditions, which rapidly bleach the red colouration.

Soil and pot

Red Cabomba grows best in nutrient-rich fine aquatic substrate. Plant in a quality planted-tank substrate (e.g., ADA Amazonia, Tropica Soil) that creates a slightly acidic root zone. In neutral substrate, add an organic acid buffer. Plant in groups of 5-9 stems and avoid disturbing the delicate root system once established. 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

Red Cabomba sits happiest at around 100% (fully aquatic) humidity and 24-28°C (75-82°F). Exclusively submersed aquatic. Not suited to emersed or paludarium cultivation under normal hobby conditions. If you keep the room above 24 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 red cabomba sparingly. Dose a comprehensive liquid fertiliser rich in iron and micronutrients daily or every other day at low doses. Potassium at 10-15 ppm supports intense red colouration. Maintain phosphate at 0.5-1.0 ppm; deficiency causes rapid deterioration. 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 red cabomba in the Growli community. Each is annotated with the most common cause so you know where to start.

• Loss of red colour — Caused by insufficient light, hard/alkaline water, or low iron; increase PAR, acidify water, and supplement iron to 0.1-0.2 ppm.
• Rapid deterioration and melting — Most commonly from hard or alkaline water; test GH and pH — this species is very intolerant of water above GH 8 or pH 7.
• Shedding leaves at purchase — Transition stress from different water parameters; acclimate slowly over 2-4 weeks by gradually adjusting pH and hardness.
• Stem rot at planting point — Plant stems shallowly (2-3 cm), ensuring no leaves are buried; improve water circulation near the substrate.
• Algae outcompeting growth — In a balanced high-tech tank with CO2 and strong lighting, healthy growth outcompetes algae; address any deficiency that slows growth.

Companion plants

Red Cabomba pairs well with Rotala macrandra, Ludwigia glandulosa, and Myriophyllum tuberculatum. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Propagate by tip cuttings 6-10 cm long from healthy, vividly coloured tops. Plant into fine substrate immediately; roots appear within 1-2 weeks under high light with CO2. Handle stems gently as the whorls are brittle. 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

Red Cabomba is pet-safe. Cabomba furcata is not listed on the ASPCA Toxic Plants database. The genus Cabomba has no documented mammalian toxicity and is used in aquaria alongside fish and invertebrates without reported harm. 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.

Red Cabomba deep-dive guides

Every aspect of red cabomba care, each with its own calibrated guide:

• Common red cabomba problems & fixes
• Red Cabomba watering schedule
• Red Cabomba light requirements
• Best soil mix for red cabomba
• Red Cabomba fertilizing guide
• When to repot red cabomba
• How to propagate red cabomba
• How to prune red cabomba
• What's eating my red cabomba?
• Red Cabomba growth rate & size
• Red Cabomba cold hardiness
• Red Cabomba temperature & humidity
• Is red cabomba toxic to cats & dogs?
• Is red cabomba toxic to cats?
• Is red cabomba toxic to dogs?

Featured in these plant shortlists

Red Cabomba qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best pet-safe houseplants — Houseplants the ASPCA lists as non-toxic to cats and dogs — every one verified against the ASPCA toxic and non-toxic plant list.
• Best pet-safe plants for bright light — Non-toxic to cats and dogs and happy in a bright, sunny spot — safe plants for your best-lit windowsill.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best cat-safe plants — Houseplants the ASPCA lists as non-toxic to cats (and dogs) — safe greenery for a home with a curious cat.
• Best dog-safe plants — Houseplants the ASPCA lists as non-toxic to dogs (and cats) — safe greenery for a home with a curious dog.
• Browse all 30 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Red Cabomba is also known as Red Cabomba, Forked Cabomba, and Purple Fanwort.

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