Penhill Dark Monarch

Penhill Dark Monarch commands attention in the garden, with large, ruffled blooms in deep smoky plum tones. The color carries a richness that feels both moody and luminous, shifting subtly as the light moves across the petals.

It grows tall and full, producing an abundance of oversized blooms on long stems. There is a natural intensity to its presence, the kind that draws the eye and holds it, making it one of the most striking varieties in the garden.

Plant details

Botanical name: Dahlia ‘Penhill Dark Monarch’
Bloom size: 10 to 12 inches
Plant height: 4.5 to 5.5 feet
Bloom form: Informal decorative
Color: deep smoky plum with subtle tonal variation
Best for: statement planting, focal arrangements, adding depth and drama
Sun needs: full sun
Spacing: 12 to 18 inches
Support: required

What you will receive

Each listing is for one dahlia tuber.

Your tuber will be a healthy, individual tuber with at least one viable eye or clear evidence of viability appropriate to the season. As a living product, tubers naturally vary in shape and size.

Shipping information

Tubers ship in spring once weather conditions are appropriate for safe transit and planting preparation. Orders may ship in batches based on region and seasonal timing.

Please note that if your order includes multiple varieties, all tubers may ship together.

Growing notes

Dahlias thrive in full sun, fertile well-draining soil, and consistent watering once established. For best results, plant after danger of frost has passed and soil has begun to warm.

Penhill Dark Monarch is a vigorous grower that produces large, heavy blooms, making strong support essential. Its long stems make it suitable for cutting, though its size and presence are especially impactful when allowed to stand prominently in the garden. Regular cutting encourages continued flowering throughout the season.

Please note

Because tubers are perishable, seasonal products, all sales are final. If there is an issue with your order, please contact us within 5 days of delivery so we can make it right where appropriate.