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Dahlia 'Bishop of Dover' (Bishop of Dover Dahlia) care

Dahlia 'Bishop of Dover'

Also called Bishop of Dover Dahlia.

RHS H3USDA 8-11Mildly toxic to petsIndoor 60-80 cm tall

Watering rhythm

3-5days

Water when the top 2-3 cm of soil dries out, roughly every 3-5 days in warm weather

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Light

Direct sun (at least 4-6 hours)

Soil

Fertile, well-drained loam with good organic matter content

Humidity

40-60%

Temp

10-24°C

Pet safety

Mildly toxic to pets

Mature size

60-80 cm tall

Care at a glance

Light

Aim for at least 4-6 hours of direct sun on the leaves. Full sun (6+ hours daily) is required for compact growth and the most prolific flowering. The white blooms show especially well when lit by afternoon sun against the dark foliage backdrop. If your only bright window faces south, that's perfect for dahlia 'bishop of dover' — same window any aroid would fry on.

Watering

Watering dahlia 'bishop of dover': water when the top 2-3 cm of soil dries out, roughly every 3-5 days in warm weather. 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 evenly moist but never waterlogged. Overwatering is the most common cause of tuber rot. Drip or base watering is preferred to overhead irrigation to reduce fungal disease.

Soil and pot

Dahlia 'Bishop of Dover' grows best in fertile, well-drained loam with good organic matter content. Prepare beds with generous additions of compost. In containers, use a quality potting compost mixed with perlite for drainage. A pH of 6.0-7.5 suits dahlias best. 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

Dahlia 'Bishop of Dover' sits happiest at around 40-60% humidity and 10-24°C (50-75°F). Average outdoor humidity is fine. Adequate air circulation around plants is more important than humidity level — poor airflow promotes mildew and botrytis. 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 dahlia 'bishop of dover' sparingly. Work a balanced fertiliser into the soil at planting. Once buds form, switch to a high-potassium (tomato-type) liquid feed every 2 weeks to support steady flowering through summer. Avoid over-feeding with nitrogen, which reduces flowering. 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 dahlia 'bishop of dover' in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Powdery mildew — White powdery coating on leaves and stems, especially in dry summers. Ensure good airflow; treat with potassium bicarbonate or fungicide.
  • Aphids — Congregate on new growth and can spread viruses. Control with insecticidal soap spray or physical removal; check plants weekly.
  • Earwigs — Ragged holes in petals are a common sign. Place rolled-up newspaper or straw-filled pots nearby as earwig traps.
  • Tuber rot in storage — Occurs when tubers are stored damp. Allow tubers to dry after lifting, label them, and pack in barely moist coir in a cool, frost-free location.
  • Virus (Dahlia mosaic) — Causes yellow mottling and stunted growth. Spread by aphids; remove infected plants and control aphids promptly.

Companion plants

Dahlia 'Bishop of Dover' pairs well with Dahlia 'Bishop of Oxford', Cosmos bipinnatus, Verbena bonariensis, and Salvia farinacea. 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

Take basal cuttings in spring from tubers pre-sprouted in warmth. Root cuttings at 18-20°C in a peat-free cutting compost. Divide tubers carefully in spring, ensuring each section has at least one growth bud on the central stem. 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

Dahlia 'Bishop of Dover' is mildly toxic to pets. Dahlia is listed by the ASPCA as causing mild toxicity in dogs, cats, and horses — primarily mild gastrointestinal signs and possible skin irritation from sap. Keep all dahlia plant parts away from pets. 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.

Dahlia 'Bishop of Dover' care — frequently asked questions

What is the common name for Dahlia 'Bishop of Dover'?

Dahlia 'Bishop of Dover' is most commonly called Dahlia 'Bishop of Dover', but it is also known as Bishop of Dover Dahlia. The names refer to the same species, so care instructions for Dahlia 'Bishop of Dover' apply identically to anything sold as Bishop of Dover Dahlia.

How much light does dahlia 'bishop of dover' need?

Dahlia 'Bishop of Dover' grows best in direct sun (at least 4-6 hours). Full sun (6+ hours daily) is required for compact growth and the most prolific flowering. The white blooms show especially well when lit by afternoon sun against the dark foliage backdrop.

How often should I water dahlia 'bishop of dover'?

Water dahlia 'bishop of dover' water when the top 2-3 cm of soil dries out, roughly every 3-5 days in warm weather. Keep soil evenly moist but never waterlogged. Overwatering is the most common cause of tuber rot. Drip or base watering is preferred to overhead irrigation to reduce fungal disease. 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 dahlia 'bishop of dover' toxic to cats and dogs?

Dahlia 'Bishop of Dover' is mildly toxic to pets. Dahlia is listed by the ASPCA as causing mild toxicity in dogs, cats, and horses — primarily mild gastrointestinal signs and possible skin irritation from sap. Keep all dahlia plant parts away from pets.

What USDA hardiness zone does dahlia 'bishop of dover' grow in?

Dahlia 'Bishop of Dover' is rated for USDA zone 8-11 (lift tubers before frost in zones 7 and colder) and RHS hardiness H3. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Dahlia 'Bishop of Dover' deep-dive guides

Every aspect of dahlia 'bishop of dover' care, each with its own calibrated guide:

Featured in these plant shortlists

Dahlia 'Bishop of Dover' qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Dahlia 'Bishop of Dover' is also commonly called Bishop of Dover Dahlia.