giant hyssop 'Blackadder'
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One of the hardiest and most reliably perennial of the genus. Its blue-black spikes of paler-lipped flowers darken in late September and provide winter interest. The aromatic leaves suggest anise
Scientific classification
- Species
- giant hyssop 'Blackadder' (Agastache 'Blackadder')
- Genus
- Agastache
- Family
- Lamiaceae
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- Toxicity
- Herbaceous Perennial
- Plant type
- 0.5-1 metres
- Height
- 0.1-0.5 metres
- Spread
- Deciduous
- Foliage
- Bushy
- Habit
- Spring · Summer · Autumn
- Season of interest
- Full sun
- Sunlight
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- Ideal temperature
giant hyssop 'Blackadder' pictures
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Distribution of giant hyssop 'Blackadder'
Distribution map
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Culture
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Toxicity
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Quick identification of giant hyssop 'Blackadder'
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giant hyssop 'Blackadder' care guide
- Moderate regular watering, allowing brief slight drying between soakings
- Watering
- Full sun
- Sunlight
- Information to be completed
- Ideal temperature
Watering
Moderate regular watering, allowing brief slight drying between soakings
Fertilizing
FertilizingBalanced perennial feed every four weeks from spring through summer
Pruning
PruningTrim back stems in late autumn to reduce windrock. Prune flowered stems back in spring
Propagation
PropagationRoot semi-ripe cuttings in late summer and overwinter under cover; propagate by division in spring. This cultivar is sterile
Growing
GrowingGrow in well-drained fertile soil in full sun. Excellent drainage is especially important during the winter months. It can suffer during cold wet winters
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Common pests and diseases
Diseases
Can suffer from powdery mildews
Pests
Generally pest-free
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