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Plant care

Missouri Coneflower (Missouri Black-eyed Susan) care

Rudbeckia missouriensis

Also called Missouri Coneflower, Missouri Black-eyed Susan.

RHS H6USDA 5–8Mildly toxic to petsIndoor 60–90 cm tall (24–36 in)

Watering rhythm

2-3weeks

Every 2–3 weeks once established; very drought-tolerant

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Light

Direct sun (at least 4-6 hours)

Soil

Dry to medium, rocky, sandy, or shallow; well-drained, often alkaline or neutral

Humidity

30–60% RH

Temp

−28°C to 38°C

Pet safety

Mildly toxic to pets

Mature size

60–90 cm tall (24–36 in)

Care at a glance

Light

Aim for at least 4-6 hours of direct sun on the leaves. Full sun is required for sturdy stems and prolific flowering. Tolerates brief intervals of partial shade but flower density and stem strength decrease noticeably. Native to open, sun-baked limestone glades with no overhead canopy. If your only bright window faces south, that's perfect for missouri coneflower — same window any aroid would fry on.

Watering

Watering missouri coneflower: every 2–3 weeks once established; very drought-tolerant. 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. Exceptionally drought-tolerant once established in its preferred rocky soil. Water regularly through the first season to establish roots, then rely on rainfall. One of the most drought-resilient species in the genus; standing water or wet soils cause root rot.

Soil and pot

Missouri Coneflower grows best in dry to medium, rocky, sandy, or shallow; well-drained, often alkaline or neutral. Native to shallow soils over limestone and dolomite substrates (pH 6.5–8.0). Thrives in rocky, gravelly, and sandy soils where drainage is perfect. Rich, moist garden soils promote lush but floppy growth. Excellent for challenging dry spots where other plants struggle. 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

Missouri Coneflower sits happiest at around 30–60% RH humidity and −28°C to 38°C (−18°F to 100°F). Adapts readily to the wide humidity range of its native Ozark and Great Plains range. The naturally hairy foliage and open branching habit allow good airflow, reducing susceptibility to mildew even in warm, humid summers. If you keep the room above −28°C to 38°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 missouri coneflower sparingly. No fertiliser required. Lean conditions improve compactness and flowering. Avoid nitrogen-rich composts or feeds, which produce tall, floppy growth at the expense of flowers. 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 missouri coneflower in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Root rot in wet or heavy soils — Being adapted to sharply drained limestone glades, this species is intolerant of waterlogged conditions. Plant in well-drained, gritty or rocky soil and avoid irrigating established plants except during severe drought.
  • Powdery mildew — Can appear on foliage in late summer in humid, crowded conditions. The open branching habit generally provides sufficient airflow to limit severity. Improve plant spacing and avoid overhead watering if mildew is problematic.

Propagation

Readily from seed. Sow directly outdoors in autumn for natural cold stratification, or cold-moist stratify for 4–6 weeks at 2–4°C (35–40°F) before indoor sowing in late winter. Self-seeds where happy. Established clumps can be divided in early spring every 3–4 years to maintain vigour. 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

Missouri Coneflower is mildly toxic to pets. Rudbeckia missouriensis is not individually listed on the ASPCA toxic or non-toxic plant database for cats, dogs, or horses. As with other Rudbeckias, sesquiterpene lactones in leaves and stems may cause contact dermatitis or mild gastrointestinal irritation if ingested in quantity. The safety status for companion animals cannot be confirmed; consult a vet if a pet ingests significant amounts. 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.

Missouri Coneflower care — frequently asked questions

What is the common name for Rudbeckia missouriensis?

Rudbeckia missouriensis is most commonly called Missouri Coneflower, but it is also known as Missouri Coneflower, Missouri Black-eyed Susan. The names refer to the same species, so care instructions for Missouri Coneflower apply identically to anything sold as Missouri Black-eyed Susan.

How much light does missouri coneflower need?

Missouri Coneflower grows best in direct sun (at least 4-6 hours). Full sun is required for sturdy stems and prolific flowering. Tolerates brief intervals of partial shade but flower density and stem strength decrease noticeably. Native to open, sun-baked limestone glades with no overhead canopy.

How often should I water missouri coneflower?

Water missouri coneflower every 2–3 weeks once established; very drought-tolerant. Exceptionally drought-tolerant once established in its preferred rocky soil. Water regularly through the first season to establish roots, then rely on rainfall. One of the most drought-resilient species in the genus; standing water or wet soils cause root rot. 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 missouri coneflower toxic to cats and dogs?

Missouri Coneflower is mildly toxic to pets. Rudbeckia missouriensis is not individually listed on the ASPCA toxic or non-toxic plant database for cats, dogs, or horses. As with other Rudbeckias, sesquiterpene lactones in leaves and stems may cause contact dermatitis or mild gastrointestinal irritation if ingested in quantity. The safety status for companion animals cannot be confirmed; consult a vet if a pet ingests significant amounts.

What USDA hardiness zone does missouri coneflower grow in?

Missouri Coneflower is rated for USDA zone 5–8 and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Missouri Coneflower deep-dive guides

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

Featured in these plant shortlists

Missouri Coneflower 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

Missouri Coneflower is also commonly called Missouri Coneflower or Missouri Black-eyed Susan.