Agastache Black Adder (Giant Hyssop)
Hardy and reliable, Agastache ‘Black Adder’ (Giant Hyssop) is a charming herbaceous perennial boasting bottle-brush, terminal spikes, 6-8 in. long (15-20 cm), packed with fragrant, tubular, two-lipped red-violet flowers emerging from dark buds.
Hardy and reliable, Agastache 'Black Adder' (Giant Hyssop) is a charming herbaceous perennial boasting bottle-brush, terminal spikes, 6-8 in. long (15-20 cm), packed with fragrant, tubular, two-lipped red-violet flowers emerging from dark buds. Blooming from mid-summer to fall, they provide a remarkably long floral display and add color as well as a lovely spiky texture to the garden.
- Forms upright clumps up to 2-3 feet tall (60-90 cm) and 18-24 in. wide (45-60 cm), with aromatic, blue-green leaves which exude an anise scent when crushed.
- Provides a bold visual impact in beds and borders, cottage gardens, gravel gardens, butterfly gardens, or Mediterranean gardens over a very long season.
- Ideal to add color to the late-season garden when many other plants are fading.
- Creates a stunning effect when mixed with other perennials or planted en masse.
- Attracts streams of hummingbirds, butterflies, and other beneficial pollinators.
- Easily grown in full sun, in average, dry to medium moisture, well-drained soils. Good drainage is particularly important.
- Drought, dry soil, and heat tolerant once established.
- Generally disease and pest-free (might occasionally be subject to powdery mildew) and resistant to deer and rabbits.
- Trim back stems in late autumn to reduce windrock. Prune flowered stems back in spring.
- Root semi-ripe cuttings in late summer and overwinter under cover; propagate by division in spring. This cultivar is sterile.
Requirements
Hardiness | 6 – 9 |
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Heat Zones | 5 – 12 |
Climate Zones | 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 |
Plant Type | Perennials |
Plant Family | Agastache – Hyssops |
Exposure | Full Sun |
Season of Interest | Summer (Mid,Late)Fall |
Height | 2' – 3' (60cm – 90cm) |
Spread | 1' – 2' (30cm – 60cm) |
Spacing | 18″ – 24″ (45cm – 60cm) |
Water Needs | Average |
Maintenance | Low |
Soil Type | Chalk, Loam, Sand |
Soil pH | Acid, Alkaline, Neutral |
Soil Drainage | Well-Drained |
Characteristics | Dried Arrangements, Cut Flowers, Fragrant, Showy |
Tolerance | Deer, Drought, Rabbit |
Attracts | Bees, Butterflies, Hummingbirds |
Garden Uses | Banks and Slopes, Beds and Borders |
Garden Styles | Gravel and Rock Garden, Informal and Cottage, Mediterranean Garden |