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 202 products.
 

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 December 2016
    •  
    • £13.99
    • 10 x 7cm potted hellebore plants

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

Heuchera 'Patchwork' Mix

Coral Flower, Coral Bells

 Customer Rating
Sprays of delicate, tiny flowers float on wiry stems above neat mounds of vibrant foliage. Prized for their colourful leaves, these versatile semi-evergreen perennials make excellent drifts of ground cover, adding a distinctive splash of colour to the front of borders, or even brightening winter containers. Their airy blooms attract bees and are also useful as cut flowers. Height and spread: 40cm (16").
More info
    • 3 heuchera Postiplugs

    • Despatch: By end of September 2016
    • + FREE £5 voucher  
    • £8.99
    • 5 heuchera Postiplug plants

    • Despatch: By end of September 2016
    •  
    • £14.99
    • 6 heuchera Postiplugs

    • Despatch: By end of September 2016
    • + FREE £5 voucher  
    • £12.99
    • 10 heuchera Postiplug plants

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

Delphinium 'Pacific Giants'

 Customer Rating
A distinguished delphinium producing strong spikes of semi-double blooms in a dreamy blend of pink, lilac, purple, violet-blue, sky-blue and white. Delphinium 'Pacific Giants' are excellent for cutting and add structure and presence to the back of cottage garden perennial borders. Height: 150cm (60"). Spread: 75cm (30").
More info
    • 6 delphinium plug plants

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

Brunnera 'Alexander's Great'

Brunnera macrophylla

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

Lewisia cotyledon 'Elise Mixed'

  • First lewisia to repeat flower throughout summer
Masses of starry flowers in a range of fruity colours, including stripes and picotees adorn slender stems above neat rosettes of fleshy leaves. Traditionally grown as perennials in alpine houses, new breeding has brought us Lewisia 'Elise Mixed' which flowers in its first year, making a bright and attractive annual bedding plant! Winner of a Fleuroselect Gold Medal, these exceptional plants repeat flower throughout summer, lighting up beds, borders, containers and rock gardens. Tolerating heat and drought well, Lewisia is also perfectly happy with cooler temperatures and will overwinter with protection from wet weather. Height: 25cm (10"). Spread: 30cm (12").
More info
    • 24 lewisia plug plants

    • Despatch:
    •  
    • £16.99
    • Out of stock
    • 48 lewisia plug plants

    • Despatch:
    • SAVE *£10.99  
    • £33.98 £22.99
    • Out of stock

Delphinium 'Rising Stars Mixed'

  • Best in class for delphiniums
We've given our customers the chance to get their hands on some very new, very different delphiniums from the world-famous 'New Zealand Hybrids' programme. There are far too many hybrids produced for our supplier to sell, so we've grouped our favourites into an exclusive 'Breeders Mixture', aptly named 'Rising Stars'! This exciting mix of delphinium flowers blends picotees, pastels, singles, doubles and frosted hybrids for a spectacular, towering display. You can even cut some blooms for a striking flower arrangement indoors. Height: 120cm (47"). Spread: 75cm (30").

SPECIAL OFFER - To get your delphinium plants at the reduced price, simply add your chosen pack size to your order and use order code TNS470Z in your shopping basket.

Please note that this offer is limited to one pack per order at this special price. This offer cannot be used in conjunction with any other offer or with promotional vouchers. Hurry, offer ends midnight Friday 1st July or while stock lasts.

More info
    • 5 delphinium jumbo plug plants

    • Despatch: By end of July 2016
    • £2.99 with order code TNS470Z  
    • £14.99
    • 10 delphinium jumbo plug plants

    • Despatch: By end of July 2016
    • £3.99 with order code TNS470Z  
    • £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 August 2016
    •  
    • £5.99

Gaillardia 'Arizona Sun'

Blanket Flower

A blaze of summertime colour that thrives, whatever the weather! The glorious daisy flowers of Gaillardia 'Arizona Sun' produce a constant display of large flower heads in fiery shades of orange, yellow and red. The cheery blooms persist well into autumn, and make spectacular cut flowers for an indoor display. This low maintenance, hardy perennial is trouble-free and even copes well on poor, dry soils. Perfect for containers or filling gaps at the front of sunny borders. Height: 30cm (12"). Spread: 45cm (18").

 

Buy this variety in a larger plant size
More info
    • 24 gaillardia plug plants

    • Despatch: By end of September 2016
    •  
    • £12.99
    • 48 gaillardia plug plants

    • Despatch: By end of September 2016
    • SAVE *£7.99  
    • £25.98 £17.99

Dianthus 'Ever-blooming Mixed' (Hardy)

Carnation

Strong upright stems carry large ruffled blooms in a vibrant mix of red, orange, yellow and pink carnations. These hardy perennial dianthus are cottage garden essentials. The fragrant carnation flowers are excellent for cutting for a bright display indoors. Perfectly proportioned for the front of sunny borders where their mounds of silvery green foliage remain evergreen throughout the year. Height: 60cm (24"). Spread: 40cm (16").

 

Culinary note: Dianthus flowers are edible.

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
    • 6 dianthus plug plants

    • Despatch: By end of August 2016
    •  
    • £5.99
    • 72 dianthus plug plants

    • Despatch: By end of September 2016
    • Double up 36 to 72 for £5 extra  
    • £15.99

Cosmos atrosanguineus 'Eclipse'

Bidens atrosanguinea, Chocolate Plant

We've topped our chocolate cosmos offering with the richest scent and colour. Cosmos 'Eclipse' surpasses all previous introductions with a scent that is utterly divine, emanating from deeply rich maroon flowers that are so dark and sensual they appear almost black – certainly the darkest cosmos you'll find on the market. Cosmos 'Eclipse' is the must-have garden plant for all chocaholics out there, the rich scent will fill the garden on a calm sunny day - you'll think someone has unwrapped your favourite chocolate bar! These sturdy cosmos plants add luxury and scent to summer containers and seasonal bedding displays. If you are looking to get 'beach fit' for you summer holiday this year, Cosmos 'Eclipse' might not be for you - you'll be heading for the snack cupboard every time you walk past your plants! Height: 45cm (18"). Spread 30cm (12"). More info
    • 4 cosmos Postiplug plants

    • Despatch: By end of July 2016
    •  
    • £9.99
    • 8 cosmos Postiplug plants

    • Despatch: By end of July 2016
    • SAVE *£1.99  
    • £19.98 £17.99

Helenium 'Moerheim Beauty' (Large Plant)

Helen's Flower, Sneezeweed

Don't get caught out with a colour-less, late summer garden - Helenium actually flower much later in the summer, so are excellent for extending the season of colour! Helenium 'Moerheim Beauty' is a choice variety, with copper-red flowers.

This hardy perennial is loved by bees and butterflies, and is the proud holder of an RHS Award of Garden Merit, so comes highly recommended as a reliable garden plant. Sneezeweed is tall, and is great for filling gaps in borders and adding height. It looks particularly good with grasses. Height: 90cm (36"). Spread: 60cm (24").

 

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

    • Despatch: By end of July 2016
    •  
    • £14.99
    • 2 x 3 litre potted helenium plants

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

Delphinium 'Black Knight' (Large Plant)

Pacific Hybrid

An absolute cottage garden classic. Plant Delphiniums in bold clumps for back-of-the-border impact. Delphinium 'Black Knight' is an extra special variety with some of the deepest indigo-blue flowers, each with a black eye.

The sight of Delphiniums in a garden is simply divine. They flower from early summer, and will often flower twice. The plants are architectural and handsome, you certainly won't regret planting these handsome perennials! Height: 1.7m (5.5'). Spread: 75cm (29").

 

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

    • Despatch: By end of July 2016
    •  
    • £11.99
    • 2 x 1 litre potted delphinium plants

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