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<i>Agastache</i> 'Blackadder'
<i>Agastache</i> 'Blackadder'
<i>Agastache</i> 'Blackadder'
<i>Agastache</i> 'Blackadder'
<i>Agastache</i> 'Blackadder'
<i>Agastache</i> 'Blackadder'
<i>Agastache</i> 'Blackadder'
<i>Agastache</i> 'Blackadder'

Agastache 'Blackadder'

hyssop (syn. Black Adder)

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Hyssops are great for adding height to a border, with whorls of long-lasting, tiny flowers arranged like a bottlebrush, and pointed,...

9cm pot
£7.99
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3 × 9cm pots
£14.79 £23.97
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6 × 9cm pots
£29.99 £47.94
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2 litre pot
£16.79
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3 × 2 litre pots
£39.99 £50.37
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1

Pot size guide

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Standard £5.99

Named Day £10.99

The ultimate midsummer bee plant with soft, stubby blue bottle brushes tinged with black- purple -the antidote to sunny orange calendulas Val Bourne - Garden Writer

Plant description

Hyssops are great for adding height to a border, with whorls of long-lasting, tiny flowers arranged like a bottlebrush, and pointed, aromatic fresh green leaves that are attractive to butterflies. They are short-lived though, and may need replacing every few years, especially after a cold or wet winter. 'Blackadder' has smoky, violet flowers on long spires from July to October. Try it as part of a Mediterranean scheme or in a sunny, well-drained border among ornamental grasses.

Eventual height & spread

Eventual height and spread

Flowering period

  • Jan
  • Feb
  • Mar
  • Apr
  • May
  • Jun
  • Jul
  • Aug
  • Sep
  • Oct
  • Nov
  • Dec

Plant features

Position

Full sun

Rate of growth

Average

Soil

Moderately fertile, moist, well-drained soil

Hardiness

Borderline hardy (will need protection in winter in colder areas)

How to care for Agastache Blackadder:

Plant in a well-prepared bed, lightly conditioned with well-rotted compost or manure. Keep cutting the old stems out to encourage repeat flowers through the summer. Once the flowering period is over, resist the temptation to cut back the faded flower-stems until early spring, as they provide interest in the winter months. Once established, lift and divide congested clumps in spring. Protect roots during the winter with a thick layer of organic mulch around the root zone.

Please note:

This perennial dies back to below ground level each year in autumn, then fresh new growth appears again in spring.

GOES WELL WITH

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Aromatic agastaches

When the heat bounces off the ground and almost overwhelms you some plants are revelling in this heat. Aromatic plants with a Mediterranean provenance like the Agastache come into their own. They are fabulous additions to the summer garden adding a verti

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How to use those dreamy flower spires

There's one garden essential that brings a planting scheme to life and it's upright flower spikes that soar heavenwards. They add drama and perspective to all your other planting and, as they open from the bottom upwards, each spire offers a glorious co

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