How to Grow New York Aster 'Royal Ruby'
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New York Aster 'Royal Ruby'
Aster novi-belgii 'Royal Ruby'
flowerA vibrant cultivar of New York Aster producing masses of deep crimson-red double flowers in fall. This bushy perennial reaches 2-3 feet tall and blooms prolifically from September through November, making it an excellent late-season garden staple. The flowers are fully double with a pompom-like appearance and attract pollinators when other blooms are scarce.
When should you plant New York Aster 'Royal Ruby' in your zone?
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Example New York Aster 'Royal Ruby' timeline · Pittsburgh, PA (Zone 6b)
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Plant New York Aster 'Royal Ruby'
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First New York Aster 'Royal Ruby' blooms
Mid-to-late summerBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact New York Aster 'Royal Ruby' dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 4-8, can be grown in zone 3 with winter protection
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Seedling
2-3 weeksTiny seedlings with first true leaves emerging; very delicate
Keep soil moist but not soggy; provide bright indirect light; thin seedlings to prevent damping off disease
Vegetative/Establishment
6-8 weeksYoung plants developing bushy foliage with multiple stems; no flowers present
Pinch back growing tips in early summer to encourage branching and fuller shape; provide consistent moisture; apply mulch around base
Budding
3-4 weeksVisible flower buds forming on stem tips; plant reaches near-full height
Reduce nitrogen fertilizer to encourage flowering; ensure adequate water during bud development; stake tall varieties if needed
Flowering
6-8 weeks (September-November)Abundant double crimson-red pompom flowers covering the plant; peak visual display
Deadhead spent blooms to encourage more flowering; stake if plants become top-heavy; provide consistent moisture
Senescence/Winter Dormancy
November-MarchFlowers fade; foliage yellows; plant dies back to ground or becomes evergreen depending on zone
Cut back dead growth in late fall or early spring; apply 2-3 inches of mulch in zone 3-4 for winter protection; do not cut back until spring in cold climates
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Improve air circulation with pruning; avoid overhead watering; apply sulfur dust or neem oil spray in early morning; resistant varieties preferred
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Remove infected leaves immediately; improve drainage and air flow; apply fungicide if severe; water only at base
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Monitor for yellowed, stippled leaves; use insecticidal soap; encourage beneficial insects; remove infested foliage
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Increase humidity with regular misting; spray leaves with water to dislodge; use neem oil or miticide if infestation is severe
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Remove and destroy infected plants; improve soil drainage; rotate planting location; choose resistant cultivars
Uses
Edible flowers in salads
CulinaryThe deep crimson petals are completely edible and add striking color and mild flavor to autumn salads, garnishes, and cocktail decorations. Ensure no pesticides were used when growing for culinary purposes. [source]
Cut flowers and arrangements
HouseholdRoyal Ruby produces exceptional long-lasting cut flowers ideal for late-season bouquets, wedding arrangements, and fall centerpieces. Double pompom flowers remain fresh in water for 7-10 days when properly conditioned. [source]
Pollinator support in fall
WildlifeProvides essential nectar and pollen for migrating monarchs, bees, and other pollinators in late fall when few other blooms are available. Critical food source during autumn migration season. [source]
Dried flowers
CraftDries beautifully while retaining deep crimson color, making it excellent for dried arrangements, wreaths, and craft projects. Superior drying compared to single-flowered aster varieties. [source]
Traditional herbal tea
MedicinalAster flowers have been used in traditional Chinese medicine and herbal preparations to support respiratory health. Contains compounds studied for anti-inflammatory properties. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut flowers in early morning when blooms are fully open for longest vase life (7-10 days with stem food). Leave at least 6 inches of stem on plants when cutting. For dried arrangements, harvest when flowers are fully double and dry slowly upside-down in dark location.
Fun Facts
- 🌱 The name 'novi-belgii' refers to New Belgium, the Dutch colonial name for the New York area where this species originated and naturalized centuries ago.
- 🌱 Royal Ruby and other double-flowered asters are actually sterile cultivars—the extra petals replaced the reproductive stamens through careful breeding, so they cannot produce viable seeds.
- 🌱 Asters are one of the last major flowers to bloom in North America, providing critical nutrition for monarch butterflies during their southern migration when most other wildflowers have finished.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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