• Nepeta 'Six Hills Giant' showing its lavender-blue flower spikes above aromatic grey-green foliage
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Hardy's Cottage Garden Plants

Nepeta 'Six Hills Giant'

Nepeta 'Six Hills Giant'

£9.50 GBP
£9.50 GBP
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Size

Plants are dispatched in growing condition and may not be in full flower. If too tall to pack safely, we may cut them back — this helps them establish more quickly. Read our Mail Order FAQs.

100% Peat Free Pollinator Friendly RHS Award of Garden Merit

'Six Hills Giant' is one of the great stalwarts of the herbaceous border — a vigorous, clump-forming catmint with aromatic grey-green foliage and tall spikes of lavender-blue flowers throughout summer. It holds an RHS Award of Garden Merit and has earned its place in gardens for decades. At 90cm it is one of the larger catmints, and it is best planted where neighbouring shrubs or perennials can offer some support.

It is tolerant of a wide range of soils, including clay, and performs well in sun or partial shade. Bees and butterflies find it irresistible; occasional deadheading will keep the flowers coming. Cut back to around 10cm in mid-September and it will regrow a good leafy clump for winter.

Height × Spread: 90cm × 90cm

☀️ Sunlight Full sun, Partial shade
📅 Season of Interest Summer
🌸 Flower Colour Blue
🌿 Foliage Colour Grey green
🪏 Preferred Soil Type Chalky, Loamy, Sandy, Clay
💧 Soil Moisture Content Low
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Plant Notes

  • Care Guide:

    Grow in well-drained soil in full sun or partial shade. After the first flush of flowers, cut back to keep the plant compact and encourage another display. Leave the old stems and foliage over winter to provide hibernation shelter for ladybirds, then cut back hard in spring as new growth emerges.

    Lift and divide large, established clumps in spring or autumn to rejuvenate them. To raise new plants, take softwood cuttings in early summer.

  • Good to Know:

    Pollinator-friendly. Drought-tolerant once established. Aromatic foliage.

    Some Nepeta attract cats, particularly catnip (Nepeta cataria). They may roll among the stems and chew the leaves, so young plants may need protection from their attention.