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    Agastache 'Black Adder' (Agastache hybride), lot de 6 godets de 9 cm sur fond blanc
  • Agastache 'Black Adder' (Agastache hybride) en massif fleuri d'épis violet foncé
  • Combien de godets d'Agastache 'Black Adder' pour ma surface : 5 à 6 godets par m², surface couverte par lot de 1,1 à 11 m²
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Agastache 'Black Adder' (Hybrid Agastache) - bee-friendly perennial with smoky purple spikes

Agastache 'Black Adder' (Hybrid Agastache) - bee-friendly perennial with smoky purple spikes

Smoke purple agastache spikes lasting until October

44,95 €
44,95 €
Livraison offerte Sale Sold out
Taxes included. Shipping calculated at checkout.
Diamètre : 9 cm · Hauteur : 10–25 cm
🐝 Loved by bumblebees💜 Smoky purple spikes☀️ Sun and dry soil
Number of plants:

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About

Agastache 'Black Adder' (Hybrid Agastache) in 9 cm pot lots

'Black Adder' agastache is a hybrid perennial from the Lamiaceae family, bred from a cross between Agastache rugosa and Agastache foeniculum. It forms an upright clump 60 to 90 cm tall, with square stems and grey-green toothed leaves that smell of anise and licorice when crushed. From July to October, it bears long, dense spikes with very dark purple calyces, dotted with small blue-purple flowers: an original smoky colour that bumblebees visit without cease.

It works well in the middle of a sunny border, in a dry flowerbed or gravel garden, where its dark spikes make yellow, orange or bright pink flowers stand out. It is available in lots of 6 to 60 9 cm pots. We recommend planting it in spring in very well-drained soil and leaving the dried stems in place until new growth appears.

  • Packaging: lots of 6, 12, 24, 48 or 60 plants in 9 cm pots
  • Height at delivery: 10 to 25 cm
  • Mature height: 60 to 90 cm
  • Spread: 45 to 60 cm
  • Flowering: July to October
  • Exposure: sun
  • Soil: well-drained, light, poor to medium; intolerant of winter waterlogging
  • Recommended planting density: 5 to 6 per m²
  • Foliage: deciduous
  • Hardiness: down to -15 °C

Grown directly by our partner nursery, each 'Black Adder' agastache arrives in a 9 cm pot, well-rooted and ready to attract pollinators to your sunny borders.

Description

Care instructions

Warranty

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Agastache 'Black Adder' (Hybrid Agastache) - bee-friendly perennial with smoky purple spikes

Propriétés des plantes

Agastache 'Black Adder' (Hybrid Agastache)

Exposition
Sun
Eau
Weak
Difficulté de culture
Easy
Toxicité animaux
Undocumented
Rusticité
Down to -15 °C
Hauteur à maturité
24 to 35 inches
Sol
Well-drained, light, poor to ordinary; dislikes standing water in winter
Rempotage
Cuttings from unflowered stems in spring, to renew the clump every 3 to 5 years
Fertilisation
None: poor to ordinary soil is sufficient; fertilizer causes the stems to become floppy.
Période de plantation
Spring (March to May); autumn possible in very free-draining soil (September to November), above frost
Distance de plantation
40 to 45 cm (5 to 6 per m²)
Profondeur de plantation
Ground-level clod (9 cm bucket)
Plante à protéger du gel
No
Type de climat
Tempered
Nom latin
Agastache 'Black Adder'
Noms communs
Agastache 'Black Adder', Hybrid Agastache
Famille botanique
Lamiaceae
Origine
Horticultural hybrid (Agastache rugosa × A. foeniculum), parents from North America and East Asia
Port
Upright clump, square stems
Forme du feuillage
Oval, toothed, aromatic leaves (anise, licorice)
Couleur du feuillage
Greyish green
Couleur de floraison
Smoky violet to purplish blue
Mois de floraison
July to October
Feuillage
Null and void
Parfumé
Yes, anise-like foliage when crushed
Mellifère
Yes
Usage
Sunny mass planting, dry border, pollinator garden, edging, gravel garden
Destination
In the ground

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Help and solutions:

Everything You Need to Know About Agastache 'Black Adder' (Hybrid Agastache) - bee-friendly perennial with smoky purple spikes

How many 'Black Adder' agapanthes should I plant per m²?

For 'Black Adder' acanthus, allow 5 to 6 plants per m², or 40 to 45 cm apart. A pack of 6 covers 1 to 1.2 m², a pack of 12 covers 2 to 2.4 m², a pack of 24 covers 4 to 4.8 m², a pack of 48 covers 8 to 9.6 m² and a pack of 60 covers 10 to 12 m². Each clump spreads to 45 to 60 cm wide: at this spacing, the clumps will join together in about two years. In a mixed border, plant it in groups of 3 or 5 to create a purple patch visible from afar.

Should 'Black Adder' anagaustache be planted in full sun?

Yes, 'Black Adder' anagaulus needs full sun, without compromise. It performs best in a hot spot: a south-facing border, against a wall, on a bank, or in a gravel garden. In partial shade, its stems become leggy, flop over, and flower poorly. Allow at least six hours of direct sunlight a day for abundant blooms through October. It also dislikes rich soil: poor to average soil produces sturdier stems and more vividly colored flower spikes.

Should 'Black Adder' be cut back in autumn?

No, do not cut back the 'Black Adder' knapweed in autumn. Its dried stems help the crown better survive the winter, and they provide shelter for insects for part of the winter. Wait until spring: when new shoots appear at the base, cut the old stems back to about ten centimetres above the ground with clean secateurs. In summer, you can remove the faded flower spikes to keep the clump tidy, although this is not essential.

When to plant 'Black Adder' anaga?

It is best to plant 'Black Adder' agastache in spring, from March to May, outside of the frost period: this gives it the whole summer to establish its roots before facing its first winter. Autumn planting, from September to November, is still possible in very well-drained soil and a mild region, but establishment is less certain. Place the top of the root ball level with the ground, without burying it, add a handful of gravel to the bottom of the hole in heavy soil, tamp down, water, and mulch with gravel.

Is bee balm toxic to cats and dogs?

The toxicity of 'Black Adder' snapdragon for cats and dogs is undocumented: no reliable source states that it is dangerous, nor that it is completely harmless. When in doubt, it is best to be cautious. Avoid planting it where your pet is likely to chew on plants, pick up cut stems in spring, and, in the event of ingestion or unusual symptoms, contact your veterinarian immediately.

Is the 'Black Adder' agastache a perennial? How long does it live?

Yes, 'Black Adder' anaga is a perennial, but a short-lived one: it generally lasts 3 to 5 years, longer in dry, well-drained soil. Known to be sterile, it does not self-seed to replace itself. To keep it in the garden, propagate it by cuttings in spring: take 8 to 10 cm unflowered shoots, remove the lower leaves and plant them in a sandy mix, sheltered from direct sunlight. Once rooted, they will replace the aging clumps.

Why did my blazing star disappear after winter?

If your bee balm disappeared after winter, it was almost always moisture, rather than the cold, that killed it. In heavy, waterlogged soil, its crown rots, whereas in well-drained earth, 'Black Adder' bee balm can withstand temperatures of around -15°C. To prevent this, plant it in light soil or on a small mound, add gravel to the planting hole, opt for mineral mulch rather than bark mulch around the crown, and leave its stems in place until spring.

Agastache 'Black Adder' (Agastache hybride) en massif fleuri d'épis violet foncé

The essentials about Agastache 'Black Adder' (Hybrid Agastache) - bee-friendly perennial with smoky purple spikes

Agastache 'Black Adder' (A. rugosa × A. foeniculum): characteristics and benefits

A horticultural hybrid of Agastache rugosa, native to East Asia, and Agastache foeniculum, native to North America, theagastache 'Black Adder' belongs to the mint family. It forms an upright clump 60 to 90 cm tall and 45 to 60 cm wide, with square stems covered in grey-green toothed leaves that smell of anise and licorice when crushed. From July to October, long, dense spikes appear, their very dark purple calyces framing small blue-violet flowers. Renowned for being sterile, this cultivar does not produce self-sown seedlings and devotes its energy to flowering. Bees, bumblebees and butterflies visit it constantly, making it a centerpiece of the pollinator garden.

Where to plant agastache 'Black Adder'? Exposure and hardiness

Its height makes it suitable for the middle of a border, behind low perennials such as catmints or bloody cranesbills, and in front of tall grasses. It requires full sun and soil that never remains waterlogged: a dry border, gravel garden, bank or border along a warm wall. Its hardiness, around -15°C, depends directly on drainage, as winter moisture is far more fatal to it than frost. Paired with echinaceas, gaura and achilleas, it naturally finds its place among our nectar-rich border perennials.

How to plant and care for agastache 'Black Adder'?

  • Soil: light, sandy or loamy, poor to average, and crucially well-drained.
  • Planting: preferably from March to May, 40 to 45 cm apart, or 5 to 6 plants per m².
  • Watering: weekly during dry weather in the first year, then rarely.
  • Pruning: leave dead stems on over winter, cut back to 10 cm in spring.

Agastache 'Black Adder' or 'Blue Fortune': which one to choose?

Both hybrids share the same upright silhouette, anise-scented foliage and sterility, which prolongs their flowering; this point therefore does not set them apart. The difference lies primarily in colour. 'Black Adder' has darker spikes, with an almost slate-grey smoky appearance, which flower until October and add depth to borders with warm tones. 'Blue Fortune' offers lighter, brighter lavender-blue spikes and is considered slightly hardier. Choose 'Black Adder' in a mild or very well-drained garden for strong contrast and late flowering; prefer 'Blue Fortune' in colder regions or if you are looking for a fresh blue that pairs with pinks and whites.

Buy agastache 'Black Adder' from Plant and Stories

Our plants are delivered in 9 cm pots, 10 to 25 cm tall, grown and shipped directly from the grower by our partner nursery. They are available in packs of 6, 12, 24, 48 or 60 plants. At 5 to 6 plants per m², a pack of 6 covers 1 to 1.2 m² and a pack of 60 covers 10 to 12 m² of sunny border. Order your agastache 'Black Adder' and offer bumblebees a late-summer feast.

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