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Agastache 'Black Adder'

Black Adder hyssop

Black Adder hyssop grows 30-36" tall and about 15" wide.  Spikes of dark violet-blue flowers bloom from summer until late fall or the first frosts.  Plant in sun or light shade.  Plant in an area that's not waterlogged.

Black Adder hyssop has a narrow, upright growth habit.  It grows 30-36" tall and about 15" wide.

Spikes of dark violet-blue flowers bloom from summer until late fall or the first frosts. 

Plant in sun or light shade.  Plant in an area that's not waterlogged in the winter otherwise the roots will rot.

Provides nectar for hummingbirds, butterflies, bees and other beneficial insects.

Regular deadheading helps prolong the blooming season.  In late fall or early winter, cut the spent flower stems back to the ground.  The plant will start putting out new shoots in spring.




Height:

30-36 Inches

Spread:

15 Inches

Spacing:

15-24 Inches

Agastache 'Black Adder' Characteristics

Attributes

  • Aromatic foliage
  • Salt Tolerant
  • Fast-growing
  • Wind resistant

Flower color

  • Blue / Purple / Lavender / Violet

Foliage color

  • Black / Burgundy / Purple / Maroon / Red

Growth habit (plant shape)

  • Upright

Exposure

  • Sunny all day - Coast
  • Light or dappled shade
  • Morning sun

Season of interest (flowering)

  • Summer

Season of interest (foliage)

  • Fall
  • Summer

Your soil type

  • Loam
  • Clay-loam
  • Clay
  • Sandy loam
  • Sand

Critter resistance

  • Rabbit resistant
  • Deer resistant

Wildlife appeal

  • Attracts bees
  • Attracts beneficial insects
  • Attracts butterflies

Suggested uses

  • Meadow

Plants that work well with Agastache 'Black Adder'

de la Mina verbena de la Mina verbena (Verbena lilacina 'de la Mina')