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Product Description
Bring graceful, cascading blooms to your garden with Empire Blue Buddleja Alternifolia, an heirloom variety known for its striking blue flowers and shade-tolerant nature. Naturally non-GMO and easy to grow, this plant thrives in borders, containers, and home landscapes. Its long-lasting blooms and elegant growth habit make it ideal for gardeners seeking low-maintenance, visually appealing plants that attract butterflies and enhance any garden setting.
Plant Type: Perennial flowering shrub
Flower Color: Blue
Growth Habit: Weeping, cascading form
Height: 36 – 72 inches
Bloom Season: Summer through fall
Uses: Borders, containers, shade gardens, butterfly-friendly gardens
Seed Quality: Heirloom, Non-GMO, high germination rate
Sowing Time: Sow seeds indoors 8–10 weeks before the last frost or directly outdoors after frost.
Soil Requirements: Well-draining, fertile soil enriched with organic matter.
Light Needs: Partial shade to full sun; tolerates some shade.
Sowing Depth: Sow seeds lightly on soil surface and press gently; do not cover deeply.
Spacing: 18 – 24 inches apart for healthy growth.
Watering: Keep soil evenly moist during germination; moderate watering once established.
Care Tips: Prune lightly after flowering to maintain shape; deadhead spent flowers to encourage continuous blooms.

Life Cycle
Annual
Planting Season
Spring–Early Summer
Growth Habit
Mounding Spreading
Flavor Profile
Not
Plant Characteristics
Deep Black Blooms
Use
Borders, Containers
Growing Conditions
Full Sun, Loamy Soil
Harvest Advantages
Continuous Bloom
Plant Resistance
Heat Tolerant
Seed Names
Black Velvet Petunia
Seed Type
Hybrid Open-Pollinated
Light Requirement
Full Sun
Planting Depth
Surface Sow
Sowing Method
Indoor or Direct
Plant Spacing
10–12 Inches
Days to Maturity
80–90 Days
Soil Preparation
No Soaking Needed
Hardiness Zones
9–11
Water Needs
Moderate
Planting Season
Spring
Seed Count
Recommended Coverage
100
Up to 50 sq ft
500
Up to 250 sq ft
1000
Up to 500 sq ft