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 594 products.
 

Giant Fragrant Cowslip

Primula florindae, Tibetan Cowslip

Stiff stems carry whorls of sulphur yellow, tubular, flowers with a delicate, sweet fragrance. Once established, Giant Cowslips will naturalise to form swathes of lush, mid green foliage that makes ideal groundcover for natural planting schemes. With an RHS AGM, Primula florindae makes a superb choice for a damp, shady corner where other plants won't grow. Height: 90cm (35"). Spread: 50cm (20").,

Culinary note: Some parts of these flowers are edible. Try the sweet tasting petals on top of salads or even pancakes, crystallise them for use as cake decorations too. For more details about edible flowers click here.

More info
    • 3 fragrant cowslip jumbo plug plants

    • Despatch: By end of June 2016
    •  
    • £12.99
    • 6 fragrant cowslip jumbo plug plants

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

Geranium 'Rozanne'

Geranium 'Gerwat'

  • Winner of The RHS Chelsea Flower Show 'Plant of the Centenary'
  • Unique long-flowering period for a Hardy Geranium

A celebrated Cranesbill producing masses of saucer shaped, violet-blue blooms with dainty white centres. Being a sterile hybrid, Geranium 'Rozanne' flowers repeatedly throughout the summer and won’t self-seed like other Geraniums. This hardy perennial makes excellent ground cover through the front of informal borders or spilling from containers. As summer ends the loose mounds of foliage colour to reddish brown and fiery orange for an extended display into autumn. Height: 30cm (12"). Spread: 60cm (24").


Useful links:

Geranium 'Rozanne gets our vote for RHS 'Plant of the Centenary'

 

More info
    • 1 geranium jumbo plug plant

    • Despatch: By end of June 2016
    •  
    • £9.99
    • 3 geranium jumbo plug plants

    • Despatch: By end of June 2016
    • SAVE *£9.98  
    • £29.97 £19.99

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").
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    • 4 delphinium Postiplug plants

    • Despatch: By end of June 2016
    •  
    • £11.99
    • 8 delphinium Postiplug plants

    • Despatch: By end of June 2016
    • SAVE *£5.99  
    • £23.98 £17.99

Foxglove 'Sugar Plum'

Digitalis

A reworking of a cottage garden classic. Foxglove 'Sugar Plum' is an improved form of old-time favourite 'Pam's Choice'. Careful selection work has led to foxglove plants with a stronger border habit and impressive flower spikes. Each bloom now carries deeper speckling and all sit closer together on the stem for a fuller display. This half-hardy foxglove makes an eye-catching addition to mixed borders and formal woodland planting schemes. Height: 120cm (48"). Spread: 45cm (18").

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    • 24 foxglove plug plants

    • Despatch: By end of July 2016
    •  
    • £13.99
    • 48 foxglove plug plants

    • Despatch: By end of July 2016
    • SAVE *£7.99  
    • £27.98 £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

Geranium 'Octavia Hill'

Pelargonium, Zonal Geranium, Zonal Pelargonium

Enormous heads of scarlet blooms with exceptional weather resistance make these giant geraniums stand out from the rest! Raised from cuttings, Geranium 'Octavia Hill' has increased vigour and abundant flowers that persist throughout summer if deadheaded regularly. Fantastic for creating dramatic patio displays or filling gaps in borders. Height: 50cm (20"). Spread: 45cm (18").
Although technically perennial, Pelargoniums are only half hardy and therefore normally treated as annuals in the UK. However, with care, they may be overwintered in a frost free greenhouse.
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    • 5 geranium jumbo plug plants

    • Despatch:
    •  
    • £9.99
    • Out of stock

Phlox paniculata 'Peppermint Twist' (Large Plant)

Perennial Phlox

Delightfully dwarf, this perennial Phlox reaches just 45cm (18") tall! Charming pink and white pinwheel blooms will fill the air with the most exquisite fragrance. With its neat, bushy habit, Phlox paniculata 'Peppermint Twist' is perfect for patio containers - plant it next to a doorway where you can really appreciate their fragrance. Highly attractive to pollinating insects, this pretty variety will brighten up the front of borders, and also makes a pleasing cut flower. Height and spread: 45cm (18"). ,

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
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    • 1 x 2 litre potted phlox plant

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

    • Despatch: By end of July 2016
    • SAVE *£5.99  
    • £25.98 £19.99

Ageratum houstonianum 'Pincushion Mixed'

Floss Flower

  • Compact plants ideal for front of border
  • 3 distinctive colours
  • More flowers than foliage!
Here we have the ideal planting solution for the front of bedding schemes, pathway edging or paving crack filler. Ageratum plants are unsung heroes of the bedding world, producing more flower than leaf. The dwarf habit of Ageratum 'Pincushion Mixed' makes this colour collection a useful garden addition where you want to fill left over space or contain other plants in a defined border of colour. The fluffy, weather-resistant flowers, in shades of blue, pink and white are particularly attractive to butterflies. Add these long flowering bedding plants in between larger container plants for pots of colour all summer. Height: 15cm (6"). Spread: 20cm (8").
More info
    • 24 ageratum plug plants

    • Despatch: By end of June 2016
    •  
    • £9.99
    • 48 ageratum plug plants

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

Gentiana scabra 'Royal Stripes'

  • Unique striped blooms
You'll be familiar with blue flowering gentian plants and you've likely seen white flowered forms, but you'll be blown away by the blue and white striped flowers of Gentiana 'Royal Stripes'. This rare new variety really brings a wow factor to the genus. Look closer at the impressive blooms and you'll also see vibrant green freckling standing out on a white canvas. Whether you use these compact herbaceous perennial plants in patio pots, borders or rockery displays, the carpet of colour is sure to attract attention from friends and family as well as bees and other pollinators. In return of a little deadheading, flowers will just keep on coming from early June through to October. Ideal for dappled shade, try Gentiana 'Royal Stripes' under trees and shrubs for a vibrant lift to your beds and borders. Height and spread: 25cm (10")
More info
    • 1 x 10.5cm potted gentiana plant

    • Despatch: By end of June 2016
    •  
    • £14.99
    • 2 x 10.5cm potted gentiana plants

    • Despatch: By end of June 2016
    • SAVE *£4.99  
    • £29.98 £24.99

Alstroemeria 'Rock 'n' Roll'

Peruvian Lily

  • Flowers until November
Ten years of breeding by Australia's leading specialists have produced this unusual new Alstromeria with amazing variegated foliage. This fantastic Peruvian Lily grows just as well in sun as in shade, with no burning of the creamy foliage. Alstroemeria 'Rock 'n' Roll' is super hardy, withstanding temperatures down to -10°C (14F). Perfect for borders and patios where it will flower continuously throughout summer, producing beautiful stems that are ideal for cutting. Height: 75cm (30"). Spread: 60cm (24").
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    • 1 alstroemeria jumbo plug plant

    • Despatch: By end of June 2016
    •  
    • £14.99
    • 3 alstroemeria jumbo plug plants

    • Despatch: By end of June 2016
    • SAVE *£19.98  
    • £44.97 £24.99

Chrysanthemum 'Hardy Patio Mixed'

As the days shorten, these shimmering chrysanthemums come into their own. Bright colours and long-lasting blooms give a real boost to the autumn garden when many things are looking tired. This collection of hardy perennial patio Mums will reward you with rounded domes of colour from September right through until the first frosts. Superb for growing in borders and containers, and the sturdy stems make excellent cut flowers too. Our young plants are supplied as a mix of 4 named varieties. Height: 100cm (39"). Spread: 60cm (24").


Companion planting: Try growing Chrysanthemums with chives, whose aromatic leaves will deter aphids.


Useful links:

Companion Planting

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    • 5 chrysanthemum Postiplug plants - 1 of each colour

    • Despatch:
    •  
    • £9.99
    • Out of stock