Photo: © Daniel IseliPlantoScanImage: PlantoScan
Dahlia Plant Care
Dahlia pinnata Cav.
Updated · Sources · How we source care data
Dahlia pinnata is a striking plant known for its vibrant and diverse flower colors, ranging from deep reds to bright yellows. Its unique leaf shape and bushy growth habit make it a popular choice among gardeners looking to add a pop of color to their landscapes.
Every 7–10 days
Full sun to partial shade
60–75°F
40–60%
At a glance
How do you care for Dahlia?
Water Dahlia 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 60–75°F (16–24°C) and 40–60% humidity. Fertilize it every 4 months during the growing season. The ASPCA lists it as toxic to cats and dogs, so keep it out of reach of pets.
Where Is the Dahlia Native To?
What Is the Dahlia?
Dahlia (Dahlia pinnata) belongs to the Asteraceae family within the Dahlia genus. Dahlia is native to Mexico, Central America. Dahlia is also known as Dahlia arborea, Dahlia cervantesii, Dahlia × cultorum.
Dahlia displays an upright, bushy perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Dahlia produces large, showy blooms in various colors.
Leaf size: approximately 6 inches.
How Often Should You Water a Dahlia?
Dahlia pinnata 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 Dahlia Need?
Dahlia thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Dahlia Prefer?
Dahlia pinnata grows best at temperatures of 60–75°F. Dahlia prefers humidity levels of 40–60%.
Temperature
60–75°F
Humidity
40–60%
What Soil Mix Works Best for a Dahlia?
Well-draining, fertile soil with added compost or organic matter. Good drainage is essential for Dahlia to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Dahlia?
Feed Dahlia every 4 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 4 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 Dahlia?
Divide and repot tubers every 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 Dahlia?
Dahlia can be propagated through division of tubers, stem cuttings. Similar propagation techniques also apply to tree dahlia plant care, which shares the same genus.
Is the Dahlia Toxic to Pets and Children?
Toxic to cats and dogs
Source: ASPCA Animal Poison Control Center plant list, which covers Dahlia species (which includes Dahlia). View the ASPCA entry
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 Dahlia?
Dahlia is susceptible to aphids, spider mites, slugs. 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 Dahlia Need?
Dahlia grows outdoors in USDA Zone 8a – 11b. It survives winters down to planting zone 8a. Dahlia is native to Mexico, Central America.
Hardiness Zone
Zone 8a – 11b
Keep exploring plants
Dahlia 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 Dahlia genus — compare its care with other Dahlia species on PlantoScan.
Dahlia is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Dahlia thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Dahlia pinnata Cav., family Asteraceae (first published in Icon. 1: 57 (1791)) — World Flora Online record, IPNI name record, Wikidata.
- Pet toxicity: The ASPCA lists Dahlia species (which includes Dahlia) as toxic to cats and dogs. Source: ASPCA Toxic and Non-Toxic Plant List.
- Photo: © Daniel Iseli, PlantoScan.
- Hardiness zone: USDA Zone 8a – 11b, estimated from the plant's typical growing conditions.
- 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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