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 39 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

Hosta undulata var. undulata (Large Plant)

Hosta undulata var. undulata gives funnel shaped, lavender blue flowers on tall spikes, which are held above the neat, weatherproof clumps of foliage. The bright green leaves have a curious, twisted growth habit which gives them a fascinating appearance.

Hosta undulata var. undulata is an RHS AGM variety, which makes a fabulous addition to borders, woodland gardens and patio containers, producing the best colour in a shady position. Height: 100cm (39"). Spread: 45cm (18").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 2 litre potted hosta plant

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

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

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

Thalictrum 'Black Stockings' (Large Plant)

The black, shimmering stems of Thalictrum 'Black Stockings' carry plenty of fluffy mauve flowers during the height of summer. This tall, willowy perennial is ideal for filling gaps in shaded borders and woodland gardens, where the delicate foliage is a useful backdrop for shorter perennials.

Thalictrum plants combines well with almost any other plant in your shady border; from ferns to hostas or even larger-leaved plants such as Rodgersia. The foliage can also be useful to add a light airy feel to summer bouquets. Height: 200cm (79"). Spread: 75cm (30").

 

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

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

    • Despatch: By end of August 2016
    •  
    • £19.99

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

Osteospermum jucundum var. compactum (Hardy)

African Daisy, Cape Daisy

Irrepressibly cheerful, bright pink daisy flowers smother carpets of low growing foliage. Versatile and resilient, hardy Osteospermum jucundum var. compactum will thrive in hot, dry, neglected conditions, yet remains one of longest-flowering plants in the garden! Expect vibrant summer colour and weed suppressing ground cover from this easy to grow, sun loving Cape Daisy. Height: 15cm (6"). Spread: 90cm (36").
More info
    • 3 osteospermum jumbo plug plants

    • Despatch: By end of August 2016
    •  
    • £11.99

Iris 'Cantina' (Re-Blooming)

Bearded Iris

The bold, violet blooms of Iris 'Cantina' are a magnificent sight in summer borders. With the first flowers appearing in late spring and continuing into summer, these really are outstanding hardy perennials. These majestic bearded iris flowers have a delicate scent and make impressive cut flowers for a vase indoors. Height: 90cm (36"). Spread: 40cm (16").

 

4 for 3 on autumn planting bulbs
More info
    • 1 Iris rhizome

    • Despatch: By end of September 2016
    •  
    • £8.99

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