How to grow catmint (Nepeta)

How to grow catmint

Grow catmint in sunny borders or raised beds in free-draining soil. Buy pot-grown plants at any time of year, although spring or autumn are ideal times to plant. Trim back faded stems to encourage more blooms during summer and once growth dies back in autumn, cut back to the ground before spring.

Growing catmint: jump links

• Planting catmint
• Caring for catmint
• Propagating catmint
• Growing catmint: problem-solving
• Advice on buying catmint
• Catmints to grow

Where to grow catmint

Catmint needs a sunny position and must have soil that drains freely, so avoid heavy soil such as clay which is prone to becoming waterlogged. Most catmints are tolerant of drought, particularly those with silvery-grey leaves. Catmints are generally fairly low growing and ideal to plant near the front of a border, close to a path or in a raised bed, to spill out and soften the edges. The low spreading growth and soft colour makes catmint ideal for underplanting rose bushes and it looks especially striking planted in groups or in long drifts.

How to plant catmint

The best times to plant catmint are in autumn or spring, although container grown plants can be planted during summer so long as they’re kept watered during dry spells until established. Depending on the ultimate spread of the variety, space plants between 30 and 60 cm apart.

How to care for catmint

Once established, catmint is easy to grow and requires little care. Flowers are produced over a long period, but it's a good idea to trim them back after blooming to keep the plant neat and to encourage more to form. Once growth dies back in late autumn, cut back the dead stems before new growth appears in spring. The dead leaves are a favourite hibernation place for ladybirds so, if possible, delay cutting back until early spring. Catmint benefits from being divided every few years as flowering declines when plants form large, congested clumps.

How to propagate catmint

Catmint can be divided once plants are several years old. Dig up the plant in autumn or early spring; break up the clump into pieces, each with plenty of roots and shoot buds, and replant into soil that has been refreshed with well-rotted compost or soil conditioner. Water well to settle soil around the roots.

Growing catmint: problem solving

Catmint is generally trouble-free given the right growing conditions, but plants rarely thrive if the ground is heavy and poorly drained, or if in shade. In very dry summers, powdery mildew may occur as a white coating on the leaves and stems sometimes die back. Cut off unhealthy shoots and gather up and bin affected fallen leaves.

Catmint varieties to grow

Catmint is available in a number of different species and varieties, ranging in shape and habit from low spreading mounds to upright clumps.

Catnip, Nepeta cataria has silvery-green leaves and violet, white-spotted flowers. Said to have the most aromatic foliage, although doesn’t flower as freely as many other varieties. Height x Spread: 90cm x 60cm

Nepeta x faassenii (sometimes also called Nepeta x mussinii) forms wide, spreading mounds of silvery-grey foliage and bears long stems covered with lavender-blue flowers. H x S: 60cm x 45cm

Nepeta ‘Junior Walker’ is more compact and upright than other catmints. H x S: 40cm x 40cm

Nepeta ‘Six Hills Giant’ is vigorous, forming a substantial mound of blue-mauve flowers 60 cm high and wide. H x S: 60cm x 40cm

Nepeta racemosa ‘Walker’s Low’ bears deep violet flowers and has green leaves. H x S: 90cm x 90cm