I’ve been purchasing bulbs from A.D.R. for many years. The quality is superior and the service fantastic. Chris and his family have always been prompt and accommodating. If you need it, Chris can find it! I wouldn’t shop anywhere else!
Anna Myatt
, Myatt Landscaping
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Dahlia 'Penhill Dark Monarch' is a dramatic dinnerplate variety with massive 10 to 12 inch blooms in plum, raspberry, and salmon tones. The petals are long, slightly twisted, and ruffled, giving each flower a moody, windswept appearance that shifts with light and age. This tall grower reaches about 48 to 60 inches and thrives in full sun with well-drained soil. Blooming from midsummer until frost, it’s ideal for cutting gardens and bold borders. Hardy in USDA zones 8 to 11.
Description | Price | |||
---|---|---|---|---|
10 Retail Packages of 1 Bulb, #1 Size tubers | $38.00 | |||
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Bulk Box of 25 Bulbs, #1 Size tubers | $64.50 | |||
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Planting: In spring, plant tubers 3 to 4 inches deep with the eye facing up, once soil has warmed to at least 60°F. Space 24 to 36 inches apart to accommodate their tall stature and massive blooms.
Location: Full sun (6–8 hours daily) is essential. Choose a sheltered spot to protect from wind, as the large flowers can be top-heavy.
Soil: Rich, loamy, well-drained soil with a slightly acidic to neutral pH (6.0–7.0). Amend with compost or decomposed leaves for aeration and fertility.
Watering: Water deeply 1–2 times per week, increasing during hot, dry spells. Avoid watering until shoots emerge to prevent rot.
Temperature: Hardy in USDA zones 8–10. In colder zones, lift tubers after frost and store in a cool, dry place.
Fertilization: Feed every 2–3 weeks with a balanced or low-nitrogen fertilizer. Overfeeding nitrogen can reduce bloom size.
Pruning: Pinch back when plants reach 12 inches tall to encourage branching. Disbud (remove side buds) to direct energy into fewer, larger blooms. Deadhead regularly to extend flowering.
Staking: Essential. Use tall stakes or cages early to support stems and prevent flopping under the weight of 10–12 inch blooms.
Pest & Disease: Watch for aphids, spider mites, and powdery mildew. Ensure good air circulation and avoid overhead watering.
Propagation: Divide tubers in spring, ensuring each has at least one viable eye.
Height | 44 Inches |
Spread | 18-20 Inches |
Hardiness Zone | 8-11 |
Color |
Pink |
Check back soon for additional details.