Agastache Blue Boa (Giant Hyssop)
Adding lovely vertical lines to the landscape, Agastache ‘Blue Boa’ (Giant Hyssop) is a striking, upright herbaceous perennial forming a low tight mound of aromatic, ultra-green leaves. From early summer to fall, it boasts long and dense spikes of deep violet-blue flowers.
Adding lovely vertical lines to the landscape, Agastache 'Blue Boa' (Giant Hyssop) is a striking, upright herbaceous perennial forming a low tight mound of aromatic, ultra-green leaves. From early summer to fall, it boasts long and dense spikes of deep violet-blue flowers. They stand out in the garden and provide a bold visual appeal. Loved by bees and hummingbirds, it is perfect for use in sunny borders.
- Grows up to 30-36 in. tall (75-90 cm) and 24 in. wide (60 cm). The aromatic leaves exude a licorice scent when crushed.
- Easily grown in full sun, in average, dry to medium moisture, well-drained soils. Good drainage is particularly important. Although a drought-tolerant plant, it might need watering in extreme dry weather spells.
- Provides a bold visual impact in beds and borders, cottage gardens, gravel gardens, butterfly gardens, or banks and slopes 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.
- Generally disease and pest-free (might occasionally be subject to powdery mildew) and resistant to deer and rabbits.
- Deadhead spent flowers to promote additional bloom.
- Propagate by division in spring.
Requirements
Hardiness | 5 – 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 (Early,Mid,Late)Fall |
Height | 2' – 3' (60cm – 90cm) |
Spread | 1' – 2' (30cm – 60cm) |
Spacing | 24″ (60cm) |
Water Needs | Low |
Maintenance | Low |
Soil Type | Chalk, Clay, Loam, Sand |
Soil pH | Acid, Alkaline, Neutral |
Soil Drainage | Moist but Well-Drained, Well-Drained |
Characteristics | 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 |