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 655 products.
 

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

Lupin 'Russell Hybrids Mixed' (Large Plant)

Lupinus

Tall spires of tightly packed flowers rise above clumps of palmate foliage in a magical array of colours. This wonderful mix of the ever popular 'Russell Hybrids' is ideal for adding height and structure to the back of perennial borders and woodland edges. A distinctive hardy perennial that remains a cottage garden favourite. Height: 90cm (36"). Spread: 50cm (20").

 

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

    • Despatch: By end of July 2016
    •  
    • £9.99
    • 2 x 2 litre potted lupin plants

    • Despatch: By end of July 2016
    • SAVE *£2.99  
    • £19.98 £16.99

Astrantia major 'Roma' (Large Plant)

Hattie's Pincushion, Masterwort

Pretty pincushion flowers in a delicate shade of pink, rise above loose clumps of attractive glossy foliage. Often seen in cottage garden borders, Astrantia major 'Roma' also thrives in the moist soil at a woodland edge or beside a pond or stream. The understated blooms, surrounded by papery outer bracts, are ideal for cutting for a delicate fresh or dried flower arrangement. Astrantia 'Roma' is one of the best varieties, and comes with an RHS AGM. The flowers persist from June to September and won't self seed as this variety is completely sterile. For almost instant gardening, choose Masterwort. Plants are quick-growing, easy to establish and long-lasting. Height: 90cm (35") and Spread: 45cm (18").

 

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

    • Despatch: By end of July 2016
    •  
    • £14.99
    • 2 x 1 litre potted astrantia plants

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

Red Hot Poker 'Fire Dance' (Large Plant)

Kniphofia, Torch Lily

The Red Hot Poker is instantly recognisable. This reliable perennial is an old favourite for mixed herbaceous borders. Kniphofia 'Fire Dance' is a particularly useful selection, as it's extremely cold hardy. The scarlet and yellow blooms rise above dense clumps of evergreen foliage in summer.Plants also prove remarkably rabbit proof and these robust plants are loved by bees and butterflies too. Height: 50cm (20") Spread: 60cm (24").

 

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

    • Despatch:
    •  
    • £12.99
    • Out of stock
    • 2 x 1 litre potted red hot poker plants

    • Despatch:
    •  
    • £19.99
    • Out of stock

Salvia nemorosa 'Marcus' (Large Plant)

Salvia are effortless, hardy plants for mixed borders. Salvia nemorosa 'Marcus' is a particularly special selection, with deep indigo flower spikes above clumps of aromatic foliage, the blooms coming in such density that they create a solid block of colour.

Salvia plants are deer resistant, rabbit resistant, and will attract bees and butterflies to your garden. Salvia 'Marcus' is short, neat and will make a strong feature towards the front of cottage garden borders and wildlife gardens. Trimming the plants in midsummer will encourage even more flowers! Height: 45cm (18"). Spread: 45cm (18").

 

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

    • Despatch: By end of July 2016
    •  
    • £12.99
    • 2 x 1 litre potted salvia plants

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

Dicentra spectablis (Large Plant)

Lamprocapnos spectabilis, Bleeding Heart, Dutchman's Breeches, Lyre Flower

Charming rose-pink, heart shaped flowers dangle enticingly from elegant arching stems, giving this plant its common name of Bleeding Heart. This beautiful spring flowering perennial is one of the earliest to bloom each year, often continuing into early summer. The finely-cut foliage forms attractive clumps that increase year after year, at a slow but steady rate. This graceful hardy perennial enjoys a reliably moist soil, making it ideal for damp woodland areas as well as cottage garden borders. Dicentra spectabilis holds an RHS AGM for its superb garden performance and makes a worthy addition to any Spring garden. Height: 120cm (48"). Spread: 45cm (18").

 

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

    • Despatch:
    •  
    • £12.99
    • Out of stock
    • 2 x 3 litre potted dicentra plants

    • Despatch:
    • SAVE *£5.99  
    • £25.98 £19.99
    • Out of stock

Penstemon 'Pensham Just Jayne' (Large Plant)

If pink is your colour then you’ll love Penstemon 'Pensham Just Jayne'. The tubular rose-pink flowers with magenta throats are borne all summer long and continue well into autumn when most perennials are tiring. Penstemons have extreme staying power and this tall variety makes a useful focal point in fading herbaceous borders. 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 September 2016
    •  
    • £9.99
    • 2 x 1 litre potted penstemon plants

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

Scabious 'Kudos'

Scabiosa, Pincushion Flower

  • A cottage garden favourite, now available for the patio
  • You don't need borders to grow this perennial favourite
  • So many blooms we lost track!
We like to tell our customers how many blooms to expect from our plants, but when it came to counting the flowers on Scabious 'Kudos' we just couldn’t keep up! Expect a long season of colour from these hardy herbaceous perennial plants. These compact plants will be smothered in delicate pale pink blooms from June through to October. Leave the last flush of flowers to turn in to attractive seedheads for winter interest. Shorter than many scabious varieties, this cottage garden classic performs perfectly in patio containers and is ideal for attracting butterflies, bees and other pollinators to the garden. If setting Scabious 'Kudos' out in the border, make sure to give it the spot it deserves at the front of your display and enjoy it for months at a time, for years to come. Height: 45cm (18"). Spread: 30cm(12").
More info
    • 5 scabious Postiplug plants

    • Despatch:
    •  
    • £9.99
    • Out of stock

Ptilotus 'Joey'

  • Major wow factor for minimum effort!
  • Exotic plumes on compact plants
  • Attractive bottlebrush flower spikes
Looking for a plant that will look after itself, and maybe even stand some neglect? Then 'Joey' is the plant for you! Originating from Australia, Ptilotus 'Joey' is perfect for those looking for exceptional heat and drought tolerance. The feathery blooms are produced in abundance and give off a neon pink glow, creating a definite talking point no matter where or how you plant them!
Excellent as a standalone container specimen or as an accent in mixed pots, Ptilotus 'Joey' also acts as the perfect compliment plant or block display in annual flower beds - 'Joey' is a natural in any sunny garden location. Pair 'Joey' with Eucalyptus gunnii, Salvia 'Amistad' or your favourite lavender for a show stopping combination. This sturdy annual will perform with some shade, but for the best display make sure to give this unusual flowering plant a prime position in the sunniest part of your garden. Height 40cm (16"). Spread 25cm (10").
More info
    • 1 x 7cm potted plant

    • Despatch: By end of July 2016
    •  
    • £11.99
    • 2 x 7cm potted plants

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

Helianthemum Collection

These tough little rock roses are hardy, drought tolerant and trouble-free, producing glorious colour from late spring to midsummer. If pruned after flowering, they'll even reward you with a second flush of blooms in late summer! The nectar-rich flowers, set against a backdrop of silvery, semi-evergreen foliage, are loved by bees and other insects. This helianthemum collection makes excellent groundcover or a versatile addition to rockeries or hot, dry borders. Height: 20cm (8"). Spread: 30cm (12").
  • Collection comprises the following varieties:
  • Helianthemum 'Ben Mohr' - Orange, saucer shaped flowers.
  • Helianthemum 'Pink Angel' - An abundance of delicate double, pink flowers.
  • Helianthemum 'The Bride' - A pretty, white rock rose with an RHS Award of Garden Merit.
  • Helianthemum 'Ben Fhada' - Bright, primrose yellow blooms with golden egg-yolk centres.
  • Helianthemum 'Peachy Keen' - New peach bloomed variety 'Peachy Keen' has an overwhelming amount of petals, further boosting the effect in your garden!
More info
    • 5 helianthemum jumbo plug plants - 1 of each variety

    • Despatch: By end of September 2016
    •  
    • £9.99
    • 10 helianthemum jumbo plug plants - 2 of each variety

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

Gerbera 'Sweet Dreams'

Barberton Daisy, Transvaal Daisy

  • T&M exclusive
  • Bigger and better winter hardy gerberas
  • Three seasons of stunning colour
Growing Gerberas outdoors was virtually inconceivable ten years ago. Now these 2nd generation hardy Gerberas can be grown year round in the border! Gerbera 'Sweet Dreams' produces plenty of cerise pink daisy blooms that are twice the size of other hardy Gerberas, and make fabulous cut flowers. Blooming reliably from June to October, these wonderful clump forming hardy perennials make a big impact in borders and patio containers. Height and spread: 45cm (18").
More info
    • 1 x 7cm potted gerbera plant

    • Despatch: By end of September 2016
    • SAVE £3  
    • £9.99 £6.99

Penstemon 'Blackberry'

Satin, bell-shaped flowers in a rich shade of purple smother the upright stems of this hardy perennial. From June onwards, the long-lasting flowers are produced above glossy, semi-evergreen foliage and continue their display well into autumn, long after most other summer perennials have faded. Penstemon 'Blackberry' is undemanding and easy to grow, tolerating almost any position in the garden, regardless of rain or drought, and even resisting slug damage! Height: 75cm (30"). Spread: 40cm (16").
More info
    • 3 penstemon jumbo plug plants

    • Despatch: By end of July 2016
    •  
    • £9.99