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Agastache ‘Black Adder’ is a dramatic perennial featuring tall, upright spikes of deep, almost black-purple flowers that bloom from mid to late summer. Its aromatic, dark green foliage adds both texture and scent to borders or containers, making it a striking focal point in any garden. Highly attractive to pollinators, this variety supports bees, butterflies, and other beneficial insects while providing long-lasting floral interest.

Thriving in full sun with well-drained soil, Agastache ‘Black Adder’ is drought-tolerant once established and low-maintenance, making it suitable for both beginner and experienced gardeners. Its long flowering period ensures continuous colour and wildlife support throughout the summer months.