Agastache 'Black Adder' belongs to the genus Agastache within the family Lamiaceae; the genus comprises aromatic, herbaceous perennials largely native to North America and known for upright spikes of tubular, two-lipped flowers. While individual cultivars vary, members of the genus typically present a vertical, spike-led flowering habit and foliage with toothed, lance-shaped leaves. Treat Agastache 'Black Adder' as you would an aromatic perennial: place where its flowering spikes are visible through the summer and into autumn. Aim for a position that avoids prolonged waterlogging and allows good air movement around the stems; soils that drain freely help prevent crown wetness in cooler, wetter seasons. A light mulch in winter can moderate soil temperatures, and removing spent flower spikes will keep the display tidy and encourage continued production of bloom within the July to October season. Use the cultivar where tall, architectural flower spikes are required — at the back of herbaceous borders, in gravel or Mediterranean-style beds, or in suitably sized containers. Its extended flowering window makes it a practical choice for filling the late-summer to autumn gap in mixed plantings; plan groupings so the vertical spikes are not obscured by neighbouring lower-growing plants.

Agastache 'Black Adder' is a cultivar of Agastache in the mint family Lamiaceae, carrying the aromatic, herbaceous character of its genus. Like other Agastache, it produces upright flower spikes of tubular, two-lipped blooms and leafy stems. It flowers from July to October. The plant suits garden situations where long summer–autumn bloom is wanted.

Agastache 'Black Adder' is an Agastache cultivar in the Lamiaceae that flowers from July to October, offering upright summer–autumn spikes.

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