Twinspur care

Light

Aim for at least 4-6 hours of direct sun on the leaves. Performs best in full sun (6+ hours daily). Tolerates very light afternoon shade in hot climates, which can extend flowering; deep shade drastically reduces bloom production. If your only bright window faces south, that's perfect for twinspur — same window any aroid would fry on.

Watering

Watering twinspur: 2–3 times per week during active growth; reduce during cooler periods. 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. Keep soil consistently moist but never waterlogged. In containers, check daily in warm weather as they dry quickly. Wilting from drought stress causes bud drop and reduced vigour.

Soil and pot

Twinspur grows best in moist, fertile, well-draining loam, ph 6.0–7.0. Rich, moisture-retentive but free-draining soil is ideal. Incorporate compost or well-rotted organic matter at planting. Avoid compacted or waterlogged soils. 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

Twinspur sits happiest at around 40–70% humidity and 5–22°C (41–72°F). Prefers moderate humidity. Tolerates typical outdoor conditions but struggles in prolonged heat combined with high humidity; good air circulation helps prevent fungal issues. If you keep the room above 5–22°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 twinspur sparingly. Feed every 2 weeks with a balanced liquid fertiliser or a high-potassium bloom formula during active flowering. In containers, begin feeding 4–6 weeks after planting. 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 twinspur in the Growli community. Each is annotated with the most common cause so you know where to start.

• Summer dormancy / heat stress — Diascia barberae often goes dormant or stops flowering when temperatures consistently exceed 25°C. Cut back by half, reduce watering, and flowering typically resumes in cooler autumn weather.
• Botrytis (grey mould) — In cool, damp conditions grey mould can rot stems and flowers. Remove affected material promptly, improve air circulation, and avoid wetting foliage when watering.
• Slugs and snails — Young growth is attractive to slugs, particularly in mild, damp climates. Use copper tape around containers, encourage predators, or apply iron phosphate pellets around garden plants.

Propagation

Take 5–8 cm tip cuttings in spring or late summer; root in moist cutting compost at 15–18°C. Also grown easily from seed sown at the soil surface (light needed for germination) at 15–18°C, 8–10 weeks before last frost. Deadhead regularly to prolong flowering. 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

Twinspur is pet-safe. Diascia barberae is not listed as toxic by the ASPCA and belongs to the Scrophulariaceae family, which has no well-documented toxic principles for dogs or cats. It is not considered a toxic plant. 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.

Twinspur deep-dive guides

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

• Twinspur watering schedule
• Twinspur light requirements
• Best soil mix for twinspur
• Twinspur fertilizing guide
• When to repot twinspur
• How to propagate twinspur
• Twinspur growth rate & size
• Twinspur cold hardiness
• Twinspur temperature & humidity
• Is twinspur toxic to cats & dogs?
• Is twinspur toxic to cats?
• Is twinspur toxic to dogs?
• Getting twinspur to bloom

Featured in these plant shortlists

Twinspur 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 trailing & climbing houseplants — Vining and trailing houseplants for shelves, hanging pots, and moss poles — selected by growth habit.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Best pet-safe trailing & hanging plants — Trailing and climbing plants the ASPCA lists as non-toxic to cats and dogs — safe for shelves and hanging pots in a pet home.
• 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 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.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Twinspur is also commonly called Twinspur or Barbera twinspur.

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• All 6887 plant care guides in the Growli library