Nemesia strumosa 'Poetry Blue' (Poetry Blue Nemesia) care

Light

Nemesia strumosa 'Poetry Blue' needs sun on the leaves, not just bright ambient room light. Full sun to light shade; full sun gives the densest flowering in cool and mild climates, while light afternoon shade eases heat stress in hot summers. Deep shade produces leggy growth and fewer blooms. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Water nemesia strumosa 'poetry blue' when the top 2-3 cm of compost is dry, roughly every 2-3 days in warm weather. 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. Prefers consistently moist soil and dislikes drying out, which quickly stalls flowering and yellows leaves, yet hates waterlogging. Keep compost evenly damp during bloom and ensure good drainage to avoid root rot.

Soil and pot

Nemesia strumosa 'Poetry Blue' grows best in fertile, humus-rich, moisture-retentive but free-draining compost. Rich, well-drained, slightly acidic soil or quality peat-free compost suits it; it dislikes alkaline, dry or waterlogged ground. Add organic matter to beds and grit to heavy soils for drainage. 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

Nemesia strumosa 'Poetry Blue' sits happiest at around 40-60% humidity and 10-24°C (50-75°F). A cool-climate annual indifferent to air humidity. Reasonable airflow keeps foliage healthy; summer heat and dry roots affect performance far more than ambient humidity. If you keep the room above 10 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 nemesia strumosa 'poetry blue' sparingly. Feed every 1-2 weeks with a balanced liquid feed through the growing season, shifting toward high-potash to sustain flowering. Container plants are hungry; regular feeding keeps growth lush and prevents premature yellowing and bloom decline. 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 nemesia strumosa 'poetry blue' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Flowering collapses in heat and drought — Hot, dry conditions make Nemesia stop blooming and go leggy fast. Keep it watered, shear back by a third, and bloom resumes as it cools.
• Yellowing from drying out or alkaline soil — Leaves yellow when roots dry out or the soil is too alkaline. Maintain even moisture, use slightly acidic compost and feed regularly.
• Root rot in waterlogged soil — Constant wet, poorly drained conditions rot the roots. Use free-draining compost and let the surface dry slightly between waterings.
• Aphids on soft growth — Aphids gather on tender shoots and buds, distorting them. Rinse off with water, apply insecticidal soap and encourage natural predators.

Propagation

Grown from seed sown indoors in early spring at 15-18°C and lightly covered, or from softwood cuttings of named selections to keep colour true. Harden off and plant out after the last frost; pinch young plants to encourage bushiness. 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

Nemesia strumosa 'Poetry Blue' is pet-safe. Nemesia is not listed on the ASPCA toxic plant database and has no recognised toxic principle; Cape jewels is generally regarded as non-toxic to cats and dogs. As it is not individually ASPCA-listed, treat as pet-safe but unconfirmed, with only mild stomach upset likely if foliage is eaten in quantity. 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.

Nemesia strumosa 'Poetry Blue' deep-dive guides

Every aspect of nemesia strumosa 'poetry blue' care, each with its own calibrated guide:

• Nemesia strumosa 'Poetry Blue' watering schedule
• Nemesia strumosa 'Poetry Blue' light requirements
• Best soil mix for nemesia strumosa 'poetry blue'
• Nemesia strumosa 'Poetry Blue' fertilizing guide
• When to repot nemesia strumosa 'poetry blue'
• How to propagate nemesia strumosa 'poetry blue'
• Nemesia strumosa 'Poetry Blue' growth rate & size
• Nemesia strumosa 'Poetry Blue' cold hardiness
• Nemesia strumosa 'Poetry Blue' temperature & humidity
• Is nemesia strumosa 'poetry blue' toxic to cats & dogs?
• Is nemesia strumosa 'poetry blue' toxic to cats?
• Is nemesia strumosa 'poetry blue' toxic to dogs?
• Getting nemesia strumosa 'poetry blue' to bloom

Featured in these plant shortlists

Nemesia strumosa 'Poetry Blue' qualifies for 12 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 drought-tolerant houseplants — Houseplants that prefer to dry out — forgiving of forgotten watering and ideal for travel or busy weeks.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best pet-safe low-maintenance plants — Non-toxic to cats and dogs and forgiving of forgotten watering — the easiest safe choices for a busy pet household.
• Best pet-safe flowering plants — Flowering houseplants the ASPCA lists as non-toxic to cats and dogs — colour and blooms in a pet home, without the worry.
• 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 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 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.
• 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.
• Best small pet-safe plants — Compact, tabletop houseplants that are also ASPCA non-toxic to cats and dogs — safe greenery for a desk or shelf.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Nemesia strumosa 'Poetry Blue' is also commonly called Poetry Blue Nemesia or Blue Cape Jewels.

• Peace lily care — light, water and common problems
• Bird of paradise care — light, water and common problems
• Hoya care — light, water and common problems
• All 5561 plant care guides in the Growli library