Agastache 'Blue Boa' (Blue Boa Hyssop) — perennial

Overview

Agastache 'Blue Boa' is a perennial in the genus Agastache, part of the Lamiaceae family. Agastache 'Blue Boa' grows best in full sun, and tolerates well-drained soils. Its UK hardiness is rated H5. Suggested uses include borders, containers and pollinator gardens.

About

Agastache 'Blue Boa' (Blue Boa Hyssop) is a perennial cultivar of the aromatic Agastache genus, known for its mint-scented leaves. It thrives in full sun with well-drained soil and benefits from a sheltered position. This drought-tolerant plant is hardy in the UK (H5) and is suitable for borders, containers, and pollinator gardens. After flowering, cutting it back encourages bushiness and a potential second bloom, making it a rewarding addition to a garden.

About the genus

Agastache is a genus of aromatic flowering herbaceous perennial plants in the family Lamiaceae. It contains 22 species, mainly native to North America, one species native to eastern Asia. The common names of the species are a variety of fairly ambiguous and confusing "hyssops" and "mints"; as a whole the genus is known as giant hyssops or hummingbird mints.

Wikipedia contributors, "Agastache", CC BY-SA 4.0 — Agastache

Growing conditions

Best soil and position for Agastache

Sunlight: full sun
Soil type: well-drained
Soil moisture: moderate
Exposure: sheltered
UK hardiness: H5

Plant details

Agastache 'Blue Boa' size, habit and characteristics

Plant type: perennial
Suggested uses: borders, containers, pollinator gardens
Fragrance: aromatic leaves with a minty scent

Care notes

Pruning and caring for Agastache 'Blue Boa'

Cultivation: Prefers well-drained soil and full sun; drought tolerant once established.
Pruning: Cut back after flowering to encourage bushiness and a second bloom.
Propagation: softwood cuttings

Frequently asked questions

How do I grow Agastache 'Blue Boa'?

Prefers well-drained soil and full sun; drought tolerant once established.

Where is the best place to plant Agastache 'Blue Boa'?

Agastache 'Blue Boa' prefers full sun. It suits sheltered positions.

What soil does Agastache 'Blue Boa' need?

Agastache 'Blue Boa' grows best in well-drained soil. Aim for soil that stays moderate.

How do I prune Agastache 'Blue Boa'?

Cut back after flowering to encourage bushiness and a second bloom.

Is Agastache 'Blue Boa' hardy in the UK?

Agastache 'Blue Boa' has an RHS hardiness rating of H5, meaning it is hardy in most of the UK, tolerating -15 to -10°C.

How do I propagate Agastache 'Blue Boa'?

Softwood cuttings.

More in the Agastache genus

Browse all Agastache →