Wavy Nerine (Wavy-petalled Nerine) care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Needs full sun for best flowering — a south-facing wall or sunny terrace is ideal. Pot-grown specimens can be placed outdoors in full sun in summer then moved under glass for the winter in colder UK regions. If your only bright window faces south, that's perfect for wavy nerine — same window any aroid would fry on.

Watering

Watering wavy nerine: very little to none in summer dormancy; regular from when flower spikes emerge in autumn through spring; stop as foliage dies back. 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. Follow the inverted watering cycle: dry summer dormancy, moist autumn through spring active period. Water at the base rather than overhead. Do not allow pots to sit in water at any time.

Soil and pot

Wavy Nerine grows best in free-draining, gritty loam-based compost or sandy garden soil. Excellent drainage is essential. In pots, use John Innes No. 2 mixed with 30–40% horticultural grit. In borders, incorporate grit and sharp sand into the planting hole. Plant with the bulb nose at or just above soil level. 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

Wavy Nerine sits happiest at around 35–55% humidity and −5–28°C (marginal outdoor hardiness; reliable to −5°C with good drainage) (23–82°F). Tolerates typical UK outdoor humidity during its active growing period. During glass-house storage in winter, ensure good ventilation to prevent fungal issues. If you keep the room above −5–28°C (marginal outdoor hardiness; reliable to −5°C with good drainage) 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 wavy nerine sparingly. Apply a high-potassium liquid feed (half-strength tomato fertiliser) monthly from when foliage is established in autumn until leaves start to yellow in late spring. Avoid any feeding during summer dormancy. 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 wavy nerine in the Growli community. Each is annotated with the most common cause so you know where to start.

• Frost kill — Less hardy than N. bowdenii — protect with a dry mulch or move containers under glass before first frosts in all but the mildest UK gardens.
• Failure to flower — Caused by watering during dormancy or too little sun. Ensure a thorough dry summer rest in full sun to bake the bulbs.
• Botrytis on flowers — Can affect flowers in damp autumnal weather. Deadhead promptly and provide shelter or cloche protection to extend the display.
• Bulb rot — Wet soil in winter is fatal to the bulbs. Containers should be brought indoors or placed under an overhang in prolonged wet, cold weather.
• Overcrowding — Unlike some nerines that dislike disturbance, N. undulata benefits from division every 4–5 years in spring to maintain vigour and flower freely.

Companion plants

Wavy Nerine pairs well with Nerine bowdenii, Schizostylis coccinea, Cyclamen hederifolium, and Colchicum autumnale. 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

Divide offset bulbs in spring just as foliage is dying down. Replant immediately at the correct depth. Seed germinates readily when fresh but plants take 3–5 years to reach flowering size. 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

Wavy Nerine is toxic to pets. Nerine undulata belongs to the Amaryllidaceae and the ASPCA lists Nerine as toxic to dogs and cats. Lycorine and related alkaloids are present throughout the plant, concentrated in the bulb. Ingestion causes vomiting, excess salivation, and lethargy. All pets should be kept away from bulbs and foliage. 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.

Wavy Nerine deep-dive guides

Every aspect of wavy nerine care, each with its own calibrated guide:

• Common wavy nerine problems & fixes
• Wavy Nerine watering schedule
• Wavy Nerine light requirements
• Best soil mix for wavy nerine
• Wavy Nerine fertilizing guide
• When to repot wavy nerine
• How to propagate wavy nerine
• How to prune wavy nerine
• What's eating my wavy nerine?
• Wavy Nerine growth rate & size
• Wavy Nerine cold hardiness
• Wavy Nerine temperature & humidity
• Is wavy nerine toxic to cats & dogs?
• Is wavy nerine toxic to cats?
• Is wavy nerine toxic to dogs?
• Getting wavy nerine to bloom

Featured in these plant shortlists

Wavy Nerine qualifies for 4 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• 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 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 30 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Wavy Nerine is also known as Wavy-petalled Nerine, Pink Nerine, and Small Guernsey Lily.

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