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Agastache cana

Agastache cana
Silver agastache

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More information

In summer, this agastache bears a multitude of raspberry-pink flowers in upright spikes on aromatic grey-green foliage. It is often cultivated as an annual in temperate climates, but is perennial in its native lands. It is an excellent plant for dry areas.
Flower size
2 cm
Height at maturity
60 cm
Spread at maturity
40 cm
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Dry soil, Moist soil
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Best planting time March to April
Recommended planting time March to June
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Flowering time June to September
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Description

Agastache cana, also known as silver agastache, is a North American botanical species appreciated for its long flowering period, aromatic vegetation, and its drought resistance. It is a pollinator-friendly plant that brings colour and life to borders, rock gardens, and containers. In theory, it is a perennial plant that quickly forms a beautiful flowering clump. It requires no watering in summer, but does not survive well in humid winters. This agastache can self-seed.

 

Agastache cana belongs to the Lamiaceae family, like mints, lavenders, and numerous aromatic plants. This species is found from the southern United States (Texas) to New Mexico. In the wild, it is found on slopes of arid mountains, between 1200 and 2000m (3937 and 6562ft) in altitude, in regions where summer and winter are dry. It is a woody-based perennial plant with trailing roots. It grows rapidly, developing into a well-branched clump that is almost as tall as it is wide. When in bloom, it measures approximately 70cm (28in) in height and 60cm (24in) in width. Its quadrangular stems bear small, lanceolate, hairy, coarsely toothed leaves, 0.8 to 1.2cm (1in) long, with a slightly greyish-green colour. When crushed, they release a slightly aniseed and minty fragrance. Flowering occurs from June to September. Short floral spikes form at the tip of the stems, measuring 4 to 6cm (2in). They are composed of numerous bilabiate tubular flowers, measuring 1.2 to 2.5cm (1in) in length, with a deep raspberry-pink colour. This flowering is nectar-rich and pollinator-friendly. The honey produced by bees after foraging on these flowers has a subtle aniseed scent. 

Agastache cana thrives in full sun and porous soils that do not retain water. According to most sources, its resistance to dry cold is estimated to be at least -15°C (5°F). This lovely plant will be ideal in natural or country-style flower beds, in a dry garden, in a rock garden, or in a vegetable garden where it can accompany thyme, savory, chervil, or basil. In a rock garden, for example, you can plant it with catmints, lavenders, cotton lavenders, rosemary, and shrub salvias. Wait until spring to plant it in humid regions. Dried flowers can be stored for a long time in bouquets. The leaves can be used in cooking as a substitute for aniseed, or in herbal teas after drying.  Rubbing the foliage on the skin is said to repel mosquitoes.

Agastache cana in pictures

Agastache cana  (Flowering) Flowering
Agastache cana  (Foliage) Foliage
Agastache cana  (Plant habit) Plant habit

Flowering

Flower colour pink
Flowering time June to September
Flower size 2 cm
Fragrance slightly scented
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Deciduous
Foliage colour green
Aromatic? Fragrant foliage when creased

Plant habit

Height at maturity 60 cm
Spread at maturity 40 cm
Growth rate fast

Botanical data

Genus

Agastache

Species

cana

Family

Lamiaceae

Other common names

Silver agastache

Origin

Cultivar or hybrid

Product reference 855311

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Planting and care

Transplant outdoors when all risk of frost has passed. Space the plants 50 to 60cm (20 to 4in) apart. Plant them in well-drained soil, in a sunny location. This plant does not tolerate wet soils in winter. It withstands summer drought once well-rooted. In humid climates, both summer and winter, it tends to behave like an annual plant.

Agastache is a generally robust and undemanding plant. It adapts to most soils, even limestone and clay, provided they are properly drained. In heavy soil, incorporate compost, gravel, or coarse sand into the garden soil. It prefers a sunny exposure or, at most, partial shade. It can self-seed abundantly and become invasive.

To protect the roots from severe frost, cover them with a thick mulch. Also protect them from slugs and snails.

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Planting period

Best planting time March to April
Recommended planting time March to June

Intended location

Suitable for Shaded rockery, Woodland edge, Undergrowth
Type of use Border, Slope
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, Rocky, sandy, well-drained

Care

Pruning instructions In spring, cut back the dry vegetation and clean the clump. Prune the faded flower spikes regularly.
Pruning Pruning recommended once a year
Pruning time March to April
Disease resistance Good
Overwinter Can be left in the ground

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