Hairy Water Clover (Rough Waterclover) care

Light

Hairy Water Clover wants the spot a few feet back from a sunny window — bright enough to read a paperback at noon, but the sun never falls directly on the leaves. Best in moderate light — 30–60 PAR in aquaria. Under bright light it forms a compact, low carpet 1–3 cm tall; under medium light fronds rise to 5–10 cm before floating. Outdoors tolerates full sun in shallow water. Avoid deep shade, which produces lax, weak fronds and inhibits carpeting. A faint hand shadow at midday is the right amount; a sharp dark shadow means it's getting direct sun and probably too much.

Watering

Water hairy water clover permanently in waterlogged substrate or submerged. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Roots must remain in saturated or submerged conditions at all times. Tolerates water temperatures of 18–28°C (64–82°F) and pH 6.0–7.5 in aquaria. In ponds, grow in a basket at 0–15 cm depth. Rhizomes survive temporary drying out but full growth resumes only when moisture returns.

Soil and pot

Hairy Water Clover grows best in nutrient-rich aquatic substrate or heavy loam. Performs best in a nutrient-dense planted-tank substrate or heavy loam/aquatic compost in pond baskets. A minimum 3 cm substrate depth allows rhizome development. Supplement with aquatic fertiliser root tabs. Coarse sand or fine gravel also works if supplemented with root-zone fertilisation. 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

Hairy Water Clover sits happiest at around High (aquatic or marginal environment) humidity and 5–28°C (41–82°F). Being an aquatic species, it grows in saturated-air conditions naturally. Emersed growth (above water) tolerates normal ambient humidity but fronds may be slightly hairier and more robust than submerged ones. No humidifier needed in outdoor or aquarium settings. If you keep the room above 5–28°C 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 hairy water clover sparingly. In aquaria, use root tabs every 2–3 months; minimal liquid macro-dosing needed given its modest growth rate. In pond tubs, push one aquatic fertiliser tablet into the basket substrate in early spring. Avoid high phosphate feeds that encourage algae in enclosed water. 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 hairy water clover in the Growli community. Each is annotated with the most common cause so you know where to start.

• Carpeting failure — fronds grow upright — Low light or deep water causes the plant to grow tall rather than carpeting. Move to a brighter position or raise the planting basket closer to the water surface; the plant will flatten into a compact carpet once light is adequate.
• Snail and herbivore damage — Bladder snails and plant-eating fish (goldfish, silver dollars) readily graze on the soft fronds, creating holes and thinning the carpet. Use copper-free snail control, add a pond net, or switch to fish species that do not browse plants.
• Rhizome rot in poor substrate — In overly fine or compacted anaerobic substrate without nutrient turnover, rhizomes can blacken and rot. Use a quality aquatic substrate, ensure gentle water movement, and refresh root tabs on schedule to keep the root zone healthy.

Propagation

Divide rhizome sections with 2–3 leaf nodes and replant into substrate 1–2 cm apart. The plant also produces stolons that root readily when they contact the substrate; separate and replant at any time during the growing season. 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

Hairy Water Clover is mildly toxic to pets. Marsilea hirsuta is not individually listed by the ASPCA. The Marsilea genus contains thiaminase (vitamin B1-destroying enzyme) documented in related species. Significant ingestion by pets could theoretically cause thiamine deficiency, though the risk from incidental nibbling is low. Keep out of reach of pets that browse aquarium plants; consult a vet if ingestion is suspected. 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.

Hairy Water Clover deep-dive guides

Every aspect of hairy water clover care, each with its own calibrated guide:

• Common hairy water clover problems & fixes
• Hairy Water Clover watering schedule
• Hairy Water Clover light requirements
• Best soil mix for hairy water clover
• Hairy Water Clover fertilizing guide
• When to repot hairy water clover
• How to propagate hairy water clover
• How to prune hairy water clover
• What's eating my hairy water clover?
• Hairy Water Clover growth rate & size
• Hairy Water Clover cold hardiness
• Hairy Water Clover temperature & humidity
• Is hairy water clover toxic to cats & dogs?
• Is hairy water clover toxic to cats?
• Is hairy water clover toxic to dogs?

Featured in these plant shortlists

Hairy Water Clover qualifies for 4 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.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Hairy Water Clover is also known as Hairy Water Clover, Rough Waterclover, and Australian Water Clover.

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