Thompson & Morgan

Important delivery notice
The products on this site are only delivered to UK addresses. If you require delivery to another country please visit one of our other sites below.

Refine Results

Refine by..

Email Newsletter

Sign up to our newsletter

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 38 products.
 

Heuchera 'Obsidian' (Large Plant)

This striking Coral Flower makes a bold statement. Fine sprays of creamy white flowers stand out against the glossy, deep maroon-black foliage. The nectar rich flowers of Heuchera 'Obsidian' attract pollinating insects and bring a light, airy feel to cut flower arrangements. This hardy evergreen perennial retains its elegant looks all year round, making it particularly useful for ground cover when planted en-masse. Perfect for individual patio pots or creating a sophisticated 'Black-tie' look in borders. Height: 45cm (18"). Spread: 30cm (12").

 

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

    • Despatch: By end of September 2016
    •  
    • £9.99
    • 2 x 1 litre potted heuchera plants

    • Despatch: By end of September 2016
    •  
    • £17.99

Blechnum brasiliense 'Volcano'

Dwarf Brazilian Tree Fern, Hard Fern

 Customer Rating
  • Hardy down to -5c in the UK
Are Dicksonia tree ferns too large or expensive for you? We've found the answer - try the dwarf Brazilian tree fern instead! Blechnum brasiliensis 'Volcano' is an exciting new find for the home gardener, only recently introduced to the UK, but sure to be the next big thing! Compact plants lend themselves well to growing in patio pots; and throw up huge fronds up to 70cm (28") tall. The young fronds unfurl in a bronze volcanic hue turning a shiny green as they open. Over time, this fern will form a small trunk, growing to around 30cm tall in 10 years. A relative of our native Deer Fern, this fern thrives in low light, so it's perfect for giving an exotic touch to your home and garden. Despite its tropical origins, Blechnum brasiliense is hardy enough to be grown in most UK gardens, tolerating temperatures down to -5C (23F) but will appreciate a sheltered spot and some winter protection. Height: 90cm (36"). Spread: 70cm (28").
More info
    • 1 x 9cm potted blechnum plant

    • Despatch: By end of September 2016
    •  
    • £14.99
    • 2 x 9cm potted blechnum plants

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

Aquilegia 'Swan Mixed'

Columbine, Granny's Bonnet

A lovely mix of colourful columbines, producing an abundance of large flowers on upright, multi-branched stems. Aquilegia 'Swan Mixed' are longer flowering than many aquilegias, and left to naturalise, they will quickly fill your garden with drifts of spring colour. Perfect for cottage gardens, perennial borders and woodland gardens. Height: 30cm (12"). Spread: 25cm (10"). More info
    • 6 aquilegia plug plants

    • Despatch: By end of September 2016
    •  
    • £5.99

Polemonium reptans 'Stairway to Heaven' (Large Plant)

Jacobs Ladder

An attractive cultivar of a cottage garden favourite. Clumps of delicate variegated foliage play host to stems of pretty light blue flowers in April and May. The cream edged leaves of Polemonium reptans 'Stairway to Heaven' are heat tolerant and develop a lovely pink tinge when grown in full sun. Jacobs Ladder is a versatile hardy perennial that needs little maintenance and makes a pleasing companion for Hostas in shadier positions. Height: 40cm (16"). Spread: 45cm (18").

 

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

    • Despatch: By end of September 2016
    •  
    • £7.99
    • 1 x 3 litre potted polemonium plant

    • Despatch:
    •  
    • £12.99
    • 2 x 1 litre potted polemonium plants

    • Despatch: By end of September 2016
    •  
    • £12.99
    • 2 x 3 litre potted polemonium plants

    • Despatch:
    •  
    • £19.99

Phlox paniculata 'Laura' (Large Plant)

Phlox paniculata 'Laura' is a particularly fine variety with a long flowering period and good resistance to mildew. This magnificent perennial produces panicles of lilac purple flowers with starry white centres all summer long. The tall stems make superb cut flowers that will fragrance bouquets with their rich, heady scent. This clump forming perennial Phlox is perfect for cottage garden borders where its blooms will attract attention from pollinating insects. Height and spread: 90cm (36").,

Culinary note: Some parts of these flowers are edible. Add the small flowers to fruit salads or crystallise them for decorating desserts. For more details about edible flowers click here.

 

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

    • Despatch: By end of September 2016
    •  
    • £12.99
    • 2 x 2 litre potted phlox plants

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

Lobelia cardinalis 'Queen Victoria' (Large Plant)

Tall spikes of deep maroon foliage topped by glowing scarlet blooms bring a welcome splash of late summer colour, when many flowers have already faded. This exotic looking, short lived perennial is ideal for filling gaps in damp borders, and looks spectacular planted beside ponds and streams. Height: 90cm (36"). Spread: 30cm (12").

 

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

    • Despatch: By end of September 2016
    •  
    • £9.99
    • 1 x 3 litre potted lobelia plant

    • Despatch: By end of September 2016
    •  
    • £12.99
    • 2 x 1 litre potted lobelia plants

    • Despatch: By end of September 2016
    •  
    • £14.99
    • 2 x 3 litre potted lobelia plants

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

Gunnera manicata (Large Plant)

Chilean Rhubarb

Gunnera is the 'big daddy' of the gardening world. The giant evergreen leaves can reach 1-2 metres across, and will add the wow factor to any garden, although isn't necessarily suitable for smaller gardens!

Also affectionately known as Giant Rhubarb, Gunnera is robust, spectacular and architectural. They make great specimen plants bog gardens and waterlogged spots, the reflection in water is especially beautiful. Gunnera manicata holds an RHS Award of Garden Merit too. Height: 2.5m (8') Spread: 4m (13').

 

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

    • Despatch: By end of September 2016
    •  
    • £9.99
    • 1 x 18 litre potted gunnera plant

    • Despatch:
    •  
    • £52.99
    • Out of stock
    • 1 x 5 litre potted gunnera plant

    • Despatch: By end of September 2016
    •  
    • £23.99
    • 2 x 1 litre potted gunnera plants

    • Despatch: By end of September 2016
    •  
    • £16.99
    • 2 x 18 litre potted gunnera plants

    • Despatch:
    •  
    • £79.99
    • Out of stock
    • 2 x 5 litre potted gunnera plants

    • Despatch: By end of September 2016
    •  
    • £35.99

Gaura lindheimeri 'Rosyjane' (Large Plant)

Gaura is a welcome addition to a mixed perennial border. The wiry, informal plants will fill gaps quickly and easily, with flowers from May to September, that's 5 months of summer colour!

Gaura 'Rosyjane' is a breeding breakthrough, with large flowers, pure white and edged in candy pink. A star of the Chelsea Flower Show, and a real treat for your cottage garden border! Quick to establish and form clumps. Height and Spread: 60cm (24").

 

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

    • Despatch: By end of September 2016
    •  
    • £9.99
    • 2 x 2 litre potted gaura plants

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

Meconopsis betonicifolia 'Blue'

Himalayan Poppy

Meconopsis betonicifolia - a stunning blue Himilayan Poppy that will certainly make an impact on its own, let alone as part of this collection. The large bowl shaped blooms will have a dramtic effect and are certainly worth a place in your garden. Height: 120cm (47"). Spread 45cm (18"). More info
    • 1 x 7cm potted meconopsis plant

    • Despatch: By end of November 2016
    •  
    • £11.99 £9.99

Hellebore 'Single Clear White' (Large Plant)

Helleborus

Hellebores are one of the first flowers to welcome a New Year in the garden, and sometimes even begin flowering in December. The Christmas Rose is ideal for shady borders, and makes useful ground cover underneath trees and shrubs.

Hellebores have colourful, nodding, cup-shaped flowers, which are long-lasting. Hellebore 'Single Clear White' produces some of the most beautiful, white flowers, and will give unmissable colour in the winter garden. Grow evergreen Hellebores in long, sweeping borders or large patio pots, they establish easily and quickly form neat clumps of growth. Height and spread: 45cm (18").

 

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

    • Despatch: By end of November 2016
    •  
    • £11.99
    • 2 x 3 litre potted hellebore plants

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

Brunnera 'Alexander's Great'

Brunnera macrophylla, Siberian Bugloss

A statement large-leaved foliage plant for borders and large containers. This hardy perennial returns bigger and better each spring producing neat clumps of heavily silver-veined leaves for dramatic effect in the garden. Use Brunnera 'Alexander's Great' as an underplanting to trees and shrubs or add in with your favourite border perennials for a winning mixed display. Sprays of airy sky-blue flowers on wirey stems also appear in spring to create extra seasonal interest. This low maintenance perennial plant thrives in shade but will happily perform in sunny locations too. Use Brunnera 'Alexander's Great' in containers on the patio to add contrast to your favourite seasonal bedding plants. Height: 40cm (16"). Spread: 90cm (36"). More info
    • 2 brunnera jumbo plug plants

    • Despatch: By end of September 2016
    •  
    • £14.99
    • 4 brunnera jumbo plug plants

    • Despatch: By end of September 2016
    •  
    • £24.99

Hellebore 'Washfield Doubles'

Helleborus x hybridus

 Customer Rating

Breathtaking, double-flowered hellebores from the 'Washfield' collection that are bred to perfection. Intriguing colours, patterns, flecks and ruffles are a sheer delight during the cold months of winter and early spring, while their leathery palmate foliage has an evergreen presence all year round. These delightful doubles come in a wide colour range including yellows, greens, blacks, reds, apricots and many other shades. Height and spread: 40cm (16").

More info
    • 5 x 7cm potted hellebore plants

    • Despatch: By end of September 2016
    •  
    • £13.99
    • 10 x 7cm potted hellebore plants

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