Mountain Mint 300 Seeds | Pycnanthemum pilosum Hardy Perennial Herb

£1.34

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Pycnanthemum pilosum – Hairy Mountain Mint
Aromatic hardy perennial with delicate summer flowers for wildlife gardens and naturalistic borders

Pycnanthemum pilosum, commonly known as Hairy Mountain Mint, is an attractive hardy herbaceous perennial with upright, branching stems and softly hairy, aromatic grey-green foliage. From midsummer, clusters of tiny white to pale lavender flowers, sometimes marked with delicate purple spots, appear above the leaves. When brushed or crushed, the foliage releases a refreshing mint-like fragrance. Established plants typically reach approximately 60–100 cm (24–39 in) tall, creating a softly textured display.

Particularly valuable in wildlife gardens, naturalistic borders and aromatic herb plantings, Hairy Mountain Mint provides nectar-rich flowers for bees, butterflies and other visiting pollinating insects. Its upright stems combine beautifully with ornamental grasses and summer-flowering perennials, while its ability to spread gradually through underground rhizomes makes it useful for informal planting where space allows. This hardy North American wildflower thrives in full sun or partial shade and tolerates occasional dry conditions once established.

Why You'll Love It

● Nectar-rich summer flowers visited by pollinating insects

● Refreshingly aromatic, softly hairy grey-green foliage

● Delicate white to pale lavender blooms with subtle markings

● Hardy herbaceous perennial that returns with fresh growth each spring

● Adaptable to well-drained soils and occasional dry conditions once established

Ideal For

● Wildlife and pollinator gardens

● Naturalistic and prairie-style borders

● Aromatic herb gardens

● Mixed perennial beds with ornamental grasses

● Informal planting areas with room for gradual spreading

How to Sow & Grow (UK)
Sow indoors: February–April, in trays or small pots filled with fine, moist seed compost
Plant out: May–June, after gradually hardening off seedlings and when the risk of frost has passed
Direct sow: April–June into a finely prepared seedbed; autumn sowing in September–October is also possible
Flowering: July–September, generally from established plants
Life cycle: Hardy herbaceous perennial (RHS H5)
Germination temperature: Approximately 18–21°C (64–70°F)
Average germ time: Approximately 14–30 days, although germination may be irregular and occasionally take longer
Depth: Surface sow or cover only extremely lightly with fine compost or vermiculite
Light required: Light exposure is beneficial; avoid burying the tiny seeds deeply
Moisture: Keep seed compost evenly moist during germination and establishment without waterlogging
Environment: Full sun to partial shade; flowering is generally best in full sun
Soil type: Well-drained sandy, loamy or clay-based garden soil
Plant spacing: Approximately 45–60 cm (18–24 in) between plants, allowing room for spreading clumps
Mature height: Approximately 60–100 cm (24–39 in)
Expert Growing Tips

● Sow the tiny seeds thinly onto the surface of fine, moist seed compost and press them gently into place. Avoid deep covering, as light exposure can help germination. Water carefully using a fine mist or from below to prevent the seeds from being washed away.

● Allow extra time for germination, which may be uneven. Maintain approximately 18–21°C (64–70°F), keep the compost lightly moist and avoid discarding trays too early if seedlings have not appeared within the usual period.

● Harden off young plants gradually before transplanting outdoors in late spring. Choose a position with good drainage and water regularly during the first growing season to help the roots establish.

● Hairy Mountain Mint spreads through underground rhizomes, gradually forming colonies. Where space is limited, control unwanted growth by trimming rhizomes or dividing established clumps in spring.

● Leave some flowering stems standing into autumn for seasonal structure and wildlife interest. Cut back old stems in late winter or early spring before fresh shoots emerge.

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