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Plant care

Valentine's Crown Vetch (Mediterranean Crown Vetch) care

Coronilla valentina

Also called Valentine's Crown Vetch, Mediterranean Crown Vetch, Shrubby Scorpion Vetch.

RHS H3USDA 8-10Toxic to petsIndoor 1–1.5 m tall and 1–1.5 m wide (3–5 ft × 3–5 ft)

Watering rhythm

2-3weeks

Low to moderate — once every 2–3 weeks when established

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Light

Direct sun (at least 4-6 hours)

Soil

Well-drained, poor to moderately fertile, neutral to alkaline

Humidity

Low to moderate (35–55% RH)

Temp

-5 to 35 °C

Pet safety

Toxic to pets

Mature size

1–1.5 m tall and 1–1.5 m wide (3–5 ft × 3–5 ft)

Care at a glance

Light

Most houseplants will scorch where valentine's crown vetch thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Full sun is essential for best flowering and compact habit; a south- or west-facing sheltered wall maximises winter warmth and triggers the earliest late-winter bloom flush. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for low to moderate — once every 2–3 weeks when established for valentine's crown vetch, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Water moderately during dry periods in the first year to establish roots; once established, the plant tolerates extended drought but appreciates an occasional deep soak during prolonged summer dry spells.

Soil and pot

Valentine's Crown Vetch grows best in well-drained, poor to moderately fertile, neutral to alkaline. Sharply draining, gritty or sandy soil suits this shrub best; it will tolerate chalky conditions but struggles in heavy clay or poorly drained positions, especially over winter. 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

Valentine's Crown Vetch sits happiest at around Low to moderate (35–55% RH) humidity and -5 to 35 °C (23 to 95 °F). Tolerates the moderate humidity of a UK coastal or sheltered garden; ensure good air circulation to prevent botrytis on the foliage in damp, mild winters. If you keep the room above 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 valentine's crown vetch sparingly. Feed with a low-nitrogen, potassium-rich fertiliser (e.g. tomato feed at half strength) once in early spring; do not over-fertilise as this promotes lush soft growth susceptible to frost damage. 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 valentine's crown vetch in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Frost damage in cold winters — Stems and foliage can be killed back in temperatures below -5 °C (23 °F), particularly with cold drying winds. Grow against a warm wall and protect the root zone with a thick mulch in winter; cut damaged stems back to healthy wood in spring.
  • Root rot in waterlogged soil — Crown and root rot caused by Phytophthora or Pythium is the most common killer of this shrub, typically showing as sudden collapse in wet winters. Improve drainage before planting and avoid any irrigation regime that keeps the root zone persistently moist.

Propagation

Take 8–10 cm semi-ripe heel cuttings in midsummer and root in free-draining compost with gentle bottom heat (18–20 °C / 64–68 °F); alternatively sow fresh seeds in spring after soaking for 12 hours in warm water. 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

Valentine's Crown Vetch is toxic to pets. Coronilla species contain cyanogenic glycosides (coronillin) throughout the plant. Ingestion by dogs or cats can cause vomiting, diarrhoea, rapid breathing, weakness, and potentially more severe cardiovascular effects in larger amounts. The plant is not listed as pet-safe by ASPCA; treat as toxic and keep pets away from all plant parts. 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.

Valentine's Crown Vetch care — frequently asked questions

What is the common name for Coronilla valentina?

Coronilla valentina is most commonly called Valentine's Crown Vetch, but it is also known as Valentine's Crown Vetch, Mediterranean Crown Vetch, Shrubby Scorpion Vetch. The names refer to the same species, so care instructions for Valentine's Crown Vetch apply identically to anything sold as Mediterranean Crown Vetch.

How much light does valentine's crown vetch need?

Valentine's Crown Vetch grows best in direct sun (at least 4-6 hours). Full sun is essential for best flowering and compact habit; a south- or west-facing sheltered wall maximises winter warmth and triggers the earliest late-winter bloom flush.

How often should I water valentine's crown vetch?

Water valentine's crown vetch low to moderate — once every 2–3 weeks when established. Water moderately during dry periods in the first year to establish roots; once established, the plant tolerates extended drought but appreciates an occasional deep soak during prolonged summer dry spells. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is valentine's crown vetch toxic to cats and dogs?

Valentine's Crown Vetch is toxic to pets. Coronilla species contain cyanogenic glycosides (coronillin) throughout the plant. Ingestion by dogs or cats can cause vomiting, diarrhoea, rapid breathing, weakness, and potentially more severe cardiovascular effects in larger amounts. The plant is not listed as pet-safe by ASPCA; treat as toxic and keep pets away from all plant parts.

What USDA hardiness zone does valentine's crown vetch grow in?

Valentine's Crown Vetch is rated for USDA zone 8-10 and RHS hardiness H3. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Valentine's Crown Vetch deep-dive guides

Every aspect of valentine's crown vetch care, each with its own calibrated guide:

Featured in these plant shortlists

Valentine's Crown Vetch qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Valentine's Crown Vetch is also known as Valentine's Crown Vetch, Mediterranean Crown Vetch, and Shrubby Scorpion Vetch.