Photo: Alexandr StanislavschiCC BY 4.0via iNaturalistresized / cropped
Joo's violet Plant Care
Viola jooi Janka
Updated · Sources · How we source care data
With heart-shaped leaves that are a striking shade of silver, Viola jooi originates from the mountains of Taiwan. This plant is highly sought after by collectors for its unique foliage color and compact growth habit, making it a standout addition to any plant collection.
Every 7–10 days
Partial shade to full sun
65–75°F
60–80%
At a glance
How do you care for Joo's violet?
Water Joo's violet every 7–10 days, letting the top layer of soil dry out between waterings, and give it partial shade to full sun. It prefers temperatures of 65–75°F (18–24°C) and 60–80% humidity. Fertilize it every month during the growing season.
What Is the Joo's violet?
Joo's violet (Viola jooi) belongs to the Violaceae family within the Viola genus. Joo's violet is native to Romania and Ukraine.
Joo's violet displays a low rosette, spreading growth habit, reaching up to tall with a spread of approximately . Joo's violet produces small, delicate flowers in various colors.
Leaf size: approximately 2 inches.
How Often Should You Water a Joo's violet?
Viola jooi 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 Joo's violet Need?
Joo's violet thrives in partial shade to full sun.
Light Requirement
Partial shade to full sun
What Temperature and Humidity Does the Joo's violet Prefer?
Viola jooi grows best at temperatures of 65–75°F. Joo's violet prefers humidity levels of 60–80%. A pebble tray or humidifier helps maintain adequate moisture around the plant.
Temperature
65–75°F
Humidity
60–80%
What Soil Mix Works Best for a Joo's violet?
Well-draining, fertile soil with high organic matter content. Good drainage is essential for Joo's violet to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Joo's violet?
Feed Joo's violet every month 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 month
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Joo's violet?
Repot every 1-2 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 Joo's violet?
Joo's violet can be propagated through seeds, division of clumps. Similar propagation techniques also apply to hooked violet plant care, which shares the same genus.
Is the Joo's violet Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Joo's violet, 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 Joo's violet?
Joo's violet 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 Joo's violet Need?
Joo's violet grows outdoors in USDA Zone 5a – 8b. It survives winters down to planting zone 5a. Joo's violet is native to Romania and Ukraine.
Hardiness Zone
Zone 5a – 8b
Keep exploring plants
Joo's violet 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 Viola genus — compare its care with other Viola species on PlantoScan.
Viola is part of the Violaceae plant family — browse all Violaceae genera and species.
Joo's violet thrives in bright light and direct sun — see other bright-light plants.
More Viola Species
Other Viola species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Viola jooi Janka, family Violaceae (first published in Oesterr. Bot. Wochenbl. 7: 198 (1857)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Joo's violet, 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.
- Photo: Alexandr Stanislavschi, CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 5a – 8b, 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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