Giant Coneflower Plant Care
Rudbeckia maxima Nutt.
Updated · Sources · How we source care data
Rudbeckia maxima, the great coneflower, is a flowering plant in the family Asteraceae, which is used as an ornamental plant. They can reach a maximum height of eight feet.
Every 7–10 days
Full sun to partial shade
60–80°F
40–60%
At a glance
How do you care for Giant Coneflower?
Water Giant Coneflower every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 60–80°F (16–27°C) and 40–60% humidity. Fertilize it every 6 months during the growing season.
What Is the Giant Coneflower?
Giant Coneflower (Rudbeckia maxima) belongs to the Asteraceae family within the Rudbeckia genus. Giant Coneflower is also known as Large Coneflower.
Giant Coneflower displays a clump-forming perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Giant Coneflower produces bright yellow or orange daisy-like flowers with dark centers.
Leaf size: approximately 6 inches.
How Often Should You Water a Giant Coneflower?
Rudbeckia maxima requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Giant Coneflower Need?
Giant Coneflower thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Giant Coneflower Prefer?
Rudbeckia maxima grows best at temperatures of 60–80°F. Giant Coneflower prefers humidity levels of 40–60%.
Temperature
60–80°F
Humidity
40–60%
What Soil Mix Works Best for a Giant Coneflower?
Well-draining, fertile soil with a mix of compost and perlite. Good drainage is essential for Giant Coneflower to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Giant Coneflower?
Feed Giant Coneflower every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Giant Coneflower?
Divide and replant every 3-4 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Giant Coneflower?
Giant Coneflower can be propagated through seeds, division of clumps. Similar propagation techniques also apply to orange coneflower plant care, which shares the same genus.
Is the Giant Coneflower Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Giant Coneflower, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Giant Coneflower?
Giant Coneflower is susceptible to aphids, slugs, snails. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Giant Coneflower Need?
Giant Coneflower grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. In cooler regions, grow Giant Coneflower as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Giant Coneflower is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Rudbeckia genus — compare its care with other Rudbeckia species on PlantoScan.
Rudbeckia is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Giant Coneflower thrives in bright light and direct sun — see other bright-light plants.
More Rudbeckia Species
Other Rudbeckia species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Rudbeckia maxima Nutt., family Asteraceae (first published in Trans. Amer. Philos. Soc. , ser. 2, 7: 354 (1840)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Giant Coneflower, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Hardiness zone: USDA Zone 13a, calculated from the plant's minimum temperature.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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