Perennial

Agastache ‘Blackadder’

Giant Hyssop 'Blackadder'
Loved by Pollinators Fragrant Scent Hardiness H4

Agastache ‘Blackadder’ is a hardy perennial producing upright stems with aromatic green foliage and tall spikes of violet-purple to blue flowers from July to October. Reaching up to 1m, it fills borders with height and colour across the season. Fragrant, generally pest-free, and loved by pollinators, it is a valuable addition to Irish cottage and gravel gardens.
SKU: AGA-2L-TS1R2M
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Flowering Months
Jan J
Feb F
Mar M
Apr A
May M
Jun J
Jul J
Aug A
Sep S
Oct O
Nov N
Dec D
Size
Max Height
0.5 m — 1.0 m
Max Spread
0.1 m — 0.5 m
Growth Habit
Densely branched plant with compact, leafy, rounded overall shape.
Planting Position
Sunlight i Indicates how much direct sunlight the plant needs each day. Full sun means 6+ hours, part shade is filtered or morning sun, and full shade is little to no direct sun.
Full Sun
Aspect i Aspect refers to the direction the planting spot faces (north, south, east or west). It affects light levels, warmth and exposure.
South West
Exposure i Exposure describes how sheltered or exposed a plant’s position is, particularly to wind and weather.
Sheltered
Hardiness i Hardiness indicates how well a plant tolerates cold conditions outdoors. Higher ratings generally mean greater frost tolerance.
(−10 to −5 °C) Hardy in most of Ireland
Ideal Soil Conditions
Soil Type i Soil type describes the texture of the soil (clay, sand, loam, chalk). This affects drainage, nutrients and how roots grow.
Chalk Loam Sand
Soil Moisture i Soil moisture tells you how wet or dry the soil should be for best growth. Match this to your garden conditions for healthier plants.
Free draining
Soil pH i Soil pH measures how acidic or alkaline the soil is. It affects nutrient availability and can impact plant growth.
Acid Alkaline Neutral
Plant Uses & Merits
Uses
  • Banks / Slopes
  • Flower Borders
Merits
  • Fragrant
  • Generally pest-free
  • Loved By Pollinators

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