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Agastache ‘Blackadder’

Agastache ‘Blackadder’ or Giant Hyssop Blackadder, is a herbaceous perennial from the Mint Family or Lamiaceae family of plants. It is a hardy plant. This cultivar is sterile.

It has deep purple-violet flowers on spikes that grow to about 3′ tall in summer and fall. The flowers are ideal for borders. They attract butterflies. Agastache ‘Blackadder’ leaves are aromatic with a hint of anise and the flower creates interest in the landscape all the way into winter.

Agastache Blackadder
Agastache Blackadder

The flowers are tubular and two-lipped. The spikes of flowers are about 8in or 20cm. The leaves are blue-green and they form a clump where spikes of flowers then grow from. Agastache Blackadder is drought-tolerant and heat-tolerant once it is established. They are also deer and rabbit resistant.

Plant them in full sun in rich and fertile and well-drained soil. It is important that the soil is well-drained as Agastache Blackadder does not like wet soil during winter.

Propagate from semi-ripe cuttings in summer or by division. Agastache Blackadder is generally pest-free and disease-free. But watch out for powdery mildew. Agastache Blackadder dies back at end of autumn and regrows in spring.

Agastache Blackadder
Purple Violet Agastache ‘Blackadder’
Agastache Blackadder
Agastache ‘Blackadder’
Agastache Blackadder
Agastache ‘Blackadder’ at Kew Gardens
Agastache Blackadder
Agastache Blackadder
Agastache Blackadder
Agastache Blackadder in a border at Kew Gardens
Agastache Blackadder
Agastache Blackadder
Agastache Blackadder
Agastache Blackadder
Agastache Blackadder
Agastache Blackadder

About Online Flower Garden & Dino

I am a flower enthusiast and a gardener at heart. Ever since childhood I loved reading about plants and started gardening at an early age. First by helping my father in the garden and later managing a large garden myself in my teen years. I planted and cared for a large number of plants, flowers, and trees both outdoors and in a greenhouse. To this day I enjoy visiting gardens and parks and learning about new and old specimens and varieties of plants.

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