Thompson & Morgan

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Perennial & Biennial Plants


In this range you'll find an impressive selection of perennial plants and biennial plants, which are perfect for beginners and experienced gardeners alike. Also known as herbaceous plants, perennial plants live for 2 or more years and flower every year. Biennial plants live for up to 2 years, flowering profusely in their second year before setting seed and dying. Both are great for beds and spring displays and there are many delightful plants to choose from.


For beautiful summer flowers browse our range of annual plants.



We have found 27 products.
 

Berkheya purpurea

Purple Sunflower, South African Thistle

  • The thistle that thinks it's a sunflower!
  • Unusual border flower
  • Excellent dried cut flower

Nicknamed the 'purple sunflower', this shining beauty makes a fantastic border plant, producing a neat, ground-hugging rosette of thistle-like foliage and a striking flower stem that demands attention in any planting display. The gently prickled leaves make it a good plant to discourage pets and other unwanted visitors away from your prized borders!

Like many other South African species, Berkheya plants are very undemanding, simply requiring a sunny spot on free draining soil. Multiple flowers appear in late summer in a silvery shade of soft violet, creating a real wow factor. The stems make unusual fresh or dried cutflowers. Best planted under a south-facing wall and given some winter frost protection in colder parts of the UK. Height: 75cm (30"). Spread: 50cm (20").

More info
    • 5 x berkheya Postiplugs plants

    • Despatch: By end of August 2016
    •  
    • £9.99
    • 10 x berkheya Postiplugs plants

    • Despatch: By end of August 2016
    • SAVE* £4.99  
    • £19.98 £14.99
    • 20 x berkheya Postiplugs plants

    • Despatch: By end of August 2016
    • SAVE* £19.97  
    • £30.96 £19.99

Dianthus 'Gran's Favourite'

Carnation, Pink

This well loved RHS AGM variety is as popular as ever for its white blooms with raspberry picotee edges. The clove scented flowers of Dianthus 'Gran's Favourite' are produced in abundance above a carpet of silvery green foliage. With such a prolific flowering period there will be plenty of blooms to spare for a vase indoors. This super little Pink is perfectly hardy and a makes a lovely addition to the front of cottage garden borders. Height and spread: 40cm (16").


Culinary note: Use the clove like tasting petals for adding to cakes, either for flavour or decorating, suitable for soups, salads and sauces too. For more details about edible flowers click here.

More info
    • 5 dianthus Postiplug plants

    • Despatch: By end of October 2016
    • save £2  
    • £9.99 £7.99
    • 10 dianthus Postiplug plants

    • Despatch: By end of August 2016
    • SAVE £2  
    • £14.99 £12.99

Viola 'Bunny Ears'

Viola x wittrockiana, Pansy

  • Add bounce to your baskets!
  • The Viola everyone wants to grow!
  • Unusual flowers add real character

Cheeky little Violas that retain that classic pansy face beneath unusually long 'rabbit ear' top petals. The compact plants are perfect for smaller containers or planting pockets in rockeries and borders - you can even set them in cracks in walls and paving. Despite their size these tidy viola plants pack a real floral punch, creating cushions of mounded colour. Height and spread: 20cm (8").
More info
    • 36 viola plug plants

    • Despatch: By end of September 2016
    •  
    • £13.99
    • 72 viola plug plants

    • Despatch: By end of September 2016
    • SAVE* £8.99  
    • £27.98 £18.99

Penstemon 'Vesuvius' (Large Plant)

Part of the 'Volcano' series, Penstemon 'Vesuvius' bears its purple-blue flowers on upright spikes throughout summer, and well into autumn. This compact variety is perfect for the front of borders where its blooms will become a magnet for pollinating insects. With a neat, upright habit Penstemon 'Vesusius' is a well behaved hardy perennial - resilient, long flowering, and easy to grow! Height: 60cm (24"). Spread: 30cm (12").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 1 litre potted penstemon plant

    • Despatch: By end of August 2016
    •  
    • £9.99
    • 2 x 1 litre potted penstemon plants

    • Despatch: By end of August 2016
    •  
    • £14.99

Delphinium 'Pink Blushes'

This Pink Blush is anything but embarrassing! Glorious, tall spikes of evenly spaced, perfectly formed florets in shades of pink, from pastel to magenta! The result of many years of breeding from Terry Dowdeswell, our world-class Delphinium expert in New Zealand, Delphinium 'Pink Blushes' are strong plants with disease resistance and unrivalled garden performance. Height: 1.5m (5'). Spread: 75cm (30").
More info
    • 5 delphinium Postiplug plants

    • Despatch: By end of August 2016
    •  
    • £12.99
    • 10 delphinium Postiplug plants

    • Despatch: By end of August 2016
    •  
    • £16.99

Penstemon 'Pensham Czar' (Large Plant)

Phenomenal stamina and indifference to rain and drought means that Penstemon 'Czar' will flower each year for an incredible five months. Mesmerising, lilac bells with satiny white throats are carried above semi evergreen foliage. These popular hardy perennials deserve prime spots in the garden or on the patio where they can really show off. Pensham penstemons also boast slug resistance and semi-evergreen foliage, giving an all round winning performance for many years. Height: 90cm (36"). Spread: 45cm (18").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 1 litre potted penstemon plant

    • Despatch: By end of August 2016
    •  
    • £9.99
    • 2 x 1 litre potted penstemon plants

    • Despatch: By end of August 2016
    •  
    • £14.99

Aubrieta cultorum 'Cascade Purple' (Large Plant)

Aubretia

Despite it diminutive size, this mat forming perennial really packs a punch in spring. Deep purple flowers cover the semi-evergreen foliage in a prolific display. The nectar rich blooms are particularly popular with bees and other pollinating insects. As its name suggests, Aubrieta cultorum 'Cascade Purple' is perfect for spilling from crevices in walls and banks, or carpeting a sunny corner of the rockery. This hardy perennial is fuss free and easy to grow, even tolerating exposed, windy positions. Height: 10cm (4"). Spread 40cm (16").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 1 litre potted aubrieta plant

    • Despatch: By end of August 2016
    •  
    • £9.99
    • 2 x 1 litre potted aubrieta plants

    • Despatch: By end of August 2016
    •  
    • £14.99

Pulmonaria 'Raspberry Splash' (Large Plant)

Lungwort

Lungwort is a low growing hardy perennial which has long been a favourite in cottage gardens. Pulmonaria 'Raspberry Splash' is a delightful variety with slender, silver spotted foliage. From March to May, clusters of raspberry pink blooms appear above the leaves, and slowly mature through purple to light mauve creating an intriguing tricolour effect. A superb choice for attracting pollinating insects to wildlife areas and creating spreading clumps of groundcover in the shade of trees and shrubs. Height: 30cm (12"). Spread: 45cm (18").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 3 litre potted pulmonaria plant

    • Despatch: By end of August 2016
    •  
    • £11.99
    • 2 x 3 litre potted pulmonaria plants

    • Despatch: By end of August 2016
    •  
    • £18.99

Mazus reptans

  • Try a new ground cover idea
This low growing, matt-forming perennial is perfect for filling gaps between stepping stones or at the front of sheltered borders and rockeries. The spreading foliage of Mazus reptans forms a dense carpet that is covered in pretty lilac-blue flowers with a yellow-spotted lower lip. This hardy, ground cover alpine has a long flowering period from late spring to July. Height: 5cm (2"). Spread: 30cm (12").
More info
    • 5 mazus jumbo plug plants

    • Despatch: By end of September 2016
    •  
    • £14.99
    • 10 mazus jumbo plug plants

    • Despatch: By end of September 2016
    • SAVE *£9.99  
    • £29.98 £19.99

Centaurea dealbata (Large Plant)

Cornflower, Bachelor's Buttons, Knapweed

This clump forming perennial Cornflower bears an abundance of lavender-pink flowers from midsummer, which are irresistible to butterflies and pollinating insects. Commonly known as Bachelor's Buttons, Centaurea dealbata will quickly form dense clumps of large, ornately cut foliage. Plant them en masse and they will knit together to create fabulous swathes of ground cover. This fuss-free perennial is perfect for herbaceous borders, cottage gardens and wildlife areas. Height: 90cm (36"). Spread: 60cm (24").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 1 litre potted centaurea plant

    • Despatch: By end of August 2016
    •  
    • £9.99
    • 2 x 1 litre potted centaurea plants

    • Despatch: By end of August 2016
    •  
    • £14.99

Agapanthus 'Lavender Haze' (Large Plant)

African Blue Lily

A very special form of the popular African Lily, 'Lavender Haze' has giant, 25cm (10") flower heads, in an unusual soft lavender colour. Agapanthus is much-loved in the UK, and can often be a reminder of holidays overseas.

An excellent, clump-forming perennial, Agapanthus is ideal for mixed perennial borders or patio pots. Plants are tough, resilient and semi-evergreen. Quick to establish, African Lilies enjoy a sunny border and any type of soil. Height: 1m (39"). Spread: 50cm (19").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 3 litre potted agapanthus plant

    • Despatch: By end of August 2016
    •  
    • £13.99
    • 2 x 3 litre potted agapanthus plants

    • Despatch: By end of August 2016
    •  
    • £22.99

Wallflower 'Variegatum' (Large Plant)

Erysimum linifolium, Cheiranthus

Perennial Wallflowers are essential for low-maintenance gardens, and they will flower twice a year, once during winter/spring, then again towards the end of the summer.

This variegated Wallflower produces the mauve, colour-changing flowers, set against evergreen cream-lined foliage. Grow Wallflower 'Variegatum' in borders, rockeries or mix with bedding plants for attractive, spring-flowering patio pots and windowboxes. Versatile and quite undemanding, this short-lived perennial is tough, will grow in the poorest of soils and is drought tolerant once established. Height and spread: 45cm (18").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 1.5 litre potted wallflower plant

    • Despatch: By end of August 2016
    •  
    • £9.99
    • 2 x 1.5 litre potted wallflower plants

    • Despatch: By end of August 2016
    •  
    • £16.99