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How to Grow Autumnalis Rosea

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Autumnalis Rosea

Prunus subhirtella 'Autumnalis Rosea'

tree

Autumnalis Rosea is a stunning ornamental cherry tree that produces delicate pale pink blossoms in autumn and early spring, offering rare off-season color to the landscape. This deciduous tree grows 20-30 feet tall and wide, with a graceful spreading habit. It is prized by gardeners for its extended blooming period and elegant branching structure.

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Example Autumnalis Rosea timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Autumnalis Rosea

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Autumnalis Rosea

    Late summer into fall

    Before the first fall frost (≈ Nov 8)

Sample dates for Pittsburgh, PA. Sign up to get exact Autumnalis Rosea dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily for best flowering; tolerates partial shade
💧
Water: Moderate water needs; water deeply and regularly during establishment (first 2-3 years), then drought-tolerant once mature. Keep soil consistently moist but not waterlogged. Reduce watering in winter dormancy.
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Spacing: 300 inches
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Days to maturity: Not applicable; flowering typically occurs 3-5 years after planting
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Planting depth: Plant at same depth as root ball; do not bury the trunk flare

Soil

Type: Well-draining loamy soil, slightly sandy or gravelly
pH: 6.0-7.0
Amendments:
Compost or aged manure at planting Mulch to retain moisture and regulate temperature Perlite or coarse sand for drainage if soil is heavy

Growing Zones

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Thrives in USDA zones 5-9, with best performance in zones 6-8

5a 5b 6a 6b 7a 7b 8a 8b 9a

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Growth Stages

1

Establishment

1-2 years

Young tree with developing root system and initial branch structure

Water deeply 2-3 times per week during first year. Stake if necessary. Avoid heavy pruning; remove only dead or crossing branches. Apply 2-3 inches of mulch around base, keeping it away from trunk.

2

Vegetative Growth

2-4 years

Tree grows in height and width, developing dense branching and foliage canopy

Maintain consistent watering during dry spells. Prune only to shape; this tree needs minimal pruning. Remove any crossing or rubbing branches. Fertilize lightly in spring with balanced fertilizer.

3

Autumn Flowering

4-8 weeks (October-November typically)

Tree produces abundant delicate pale pink blossoms in September-November, depending on climate

Do not prune during or immediately before flowering season as this removes developing flower buds. Ensure adequate moisture to support flowering. Early frosts may damage open blooms in colder zones.

4

Spring Flowering

3-4 weeks

Secondary, lighter flush of pale pink blossoms appears in early spring (March-April) as tree leafs out

Protect from late frost damage if possible. Do not fertilize right before spring bloom. Light pruning for shape can occur immediately after spring flowering ends.

5

Summer Dormancy

May-August

Tree is fully leafed out with green foliage; minimal flowering during summer months

Water during hot, dry periods. Monitor for pests and diseases. Prune out any dead wood. Enjoy the shade and structure the tree provides.

Companion Planting

Plan your garden →

Plant with:

Autumn-flowering bulbs (Colchicum, Sternbergia) Understory shade plants (Hosta, Heuchera) Spring bulbs (Daffodil, Tulip, Crocus) Autumn asters Japanese maple

Avoid planting near:

Black walnut (Juglans nigra) - produces juglone toxin Shallow-rooted competitors requiring same moisture (Maple species) Plants preferring acidic soil if amending for cherry

Common Pests

  • Hand-pick early morning, use row covers on young trees, apply neem oil or insecticidal soap, encourage parasitic wasps

  • Prune out infected branches 6 inches below knot during dormancy, sterilize pruning tools, improve air circulation, apply fungicide if severe

  • Spray with strong water stream, apply neem oil or insecticidal soap, increase humidity around tree, avoid excessive fertilization

  • Remove tents by hand (wear gloves), prune out heavily infested branches, apply Bacillus thuringiensis (Bt) in spring, encourage natural predators

  • Prune out infected branches at least 6 inches below canker, sterilize tools between cuts, improve tree vigor with proper watering, avoid wounding bark

Uses

🎨

Cut Flower Arrangements

Craft

The delicate pale pink cherry blossoms are excellent for indoor floral arrangements and traditional ikebana design. Cut branches in early morning stages and condition in water for 2-4 hours before arranging. [source]

🦋

Pollinator Support

Wildlife

Early autumn and spring blooms provide valuable nectar and pollen for bees, butterflies, and other pollinators during periods when few other plants are flowering. The tree supports ecosystem health by extending the bloom season. [source]

🏠

Ornamental Landscape Feature

Household

With its graceful form, extended blooming period, and elegant branching structure, Autumnalis Rosea serves as a specimen tree or focal point in gardens. The tree adds visual interest during seasons when most ornamentals are dormant. [source]

🍳

Edible Flowers

Culinary

The delicate petals can be used as an edible garnish for desserts and beverages in Japanese cuisine and modern culinary presentations. Ensure the tree has not been treated with pesticides before harvesting flowers for consumption. [source]

💊

Traditional Herbal Use

Medicinal

In traditional Asian medicine, cherry blossoms are used to make infusions and teas believed to have calming and anti-inflammatory properties. Modern herbalists and tea enthusiasts use the flowers for sakura tea preparation. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

This is an ornamental tree grown for flowers, not fruit. Enjoy blossoms on the tree or cut branches for indoor arrangements. Cut flowering branches in early morning and place in water immediately for longest vase life.

Fun Facts

  • 🌱 Autumnalis Rosea is one of the few ornamental cherry varieties that blooms reliably in fall, making it a rarity in gardens and highly prized by plant collectors and designers seeking off-season interest.
  • 🌱 The tree's scientific name 'subhirtella' refers to its slightly hairy twigs and buds, which help gardeners distinguish it from other Prunus species in winter.
  • 🌱 In Japan, where cherry blossoms hold deep cultural significance, autumn-blooming varieties like Autumnalis Rosea are celebrated as a second flowering season that extends the traditional hanami (flower viewing) season beyond spring.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Full Sun Mulch Partial Shade
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