Dianthus

Dianthus barbatus

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verifiedReviewed by the GreenScout Team

Dianthus barbatus, commonly known as Sweet William, produces clusters of fragrant, colorful flowers in shades of pink, red, white, and bicolors on sturdy stems. This hardy biennial or short-lived perennial blooms prolifically in late spring and early summer and self-seeds readily in gardens. It is low-maintenance, drought-tolerant once established, and attracts pollinators.

Common Problems

Select the problem your Dianthus is experiencing to get a treatment guide.

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Yellow Leaveschevron_right

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Root Rotchevron_right

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Wiltingchevron_right

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Brown Spotschevron_right

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Overwateringchevron_right

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Slow Growthchevron_right

Care Guide

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Light

Full sun to partial shade; requires 6+ hours of direct sunlight daily for best flowering.

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Water

Water moderately; keep soil consistently moist during growing season but allow to dry between waterings. Reduce watering after flowering.

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Soil

Well-draining, fertile soil with neutral to slightly alkaline pH (6.5–7.5). Amend with compost or peat moss.

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Fertiliser

Light feeding in spring with balanced fertilizer (10–10–10); reduce nitrogen to avoid excess foliage at expense of flowers.

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Temperature

Hardy biennial tolerating 30–75°F (-1–24°C); prefers cool conditions and is highly cold-tolerant.

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Humidity

Moderate humidity (40–60%); ensure good air circulation to prevent fungal issues. Avoid overhead watering.

Toxicity

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Non-toxic to cats, dogs, and children; completely safe for all households.

Common Diseases

filter_dramaRoot Rotchevron_right grainLeaf Spotchevron_right spaPowdery Mildewchevron_right

Common Pests

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Seasonal Care

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Resume regular watering and feeding as growth picks up.

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Peak growing season. Water and feed regularly.

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Reduce watering as growth slows. Stop heavy feeding.

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Minimal watering and feeding. Protect from frost if needed.

Frequently Asked Questions

Is Dianthus (Sweet William) the same as Carnation?

They're closely related genus-mates, but Dianthus barbatus (Sweet William) is a hardy biennial with clustered fragrant blooms, while Carnation (Dianthus caryophyllus) is grown more as a perennial with larger, ruffled single flowers.

Will Dianthus come back year after year?

It's a hardy biennial or short-lived perennial that self-seeds readily, so while individual plants may not persist for many years, new seedlings often keep the display going.