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 16 products.
 

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

More info
    • 5 chrysanthemum Postiplug plants - 1 of each colour

    • Despatch: By end of July 2016
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    • £9.99

Dierama Collection

Angel's Fishing Rod

Clusters of delicate bell shaped flowers dangle from impossibly slender stems that arch and tremble in the breeze. From July, the elegant blooms rise above clumps of slender, semi-evergreen, grass like foliage before giving way to attractive seedheads in late summer. Dierama is a truly graceful hardy perennial and makes a most beautiful addition to cottage garden borders, adding movement and fluidity to planting schemes. Often referred to as Angel's Fishing Rod, it looks particularly attractive when overhanging water. Height: 100cm (39"). Spread: 45cm (18").

  • Collection comprises:
  • Dierama argyruem - Dazzling white bell shaped flowers that dangle from arching stems.
  • Dierama 'Blackberry Bells' - Deep purple pink blooms on wiry stems.
  • Dierama erectum - Stiffer stems filled with outward facing blooms, rather than pendulous flowers.
More info
    • 3 x 9cm potted dierama plants

    • Despatch: By end of July 2016
    •  
    • £19.99
    • 6 x 9cm potted dierama plants

    • Despatch: By end of July 2016
    •  
    • £29.99

Crocosmia 'Lucifer' (Large Plant)

Montbretia

Tall arching stems drip with fiery red trumpets above crimped, sword-like foliage. Crocosmia 'Lucifer' is well loved for its late summer display that erupts in a blaze of colour as other border perennials begin to fade. This RHS AGM variety is renowned for its vigour and resilience, adding structure and height to sunny herbaceous borders. The tall stems make eye-catching cut flowers too.Height: 100cm (39"). Spread: 10cm (4").

 

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

    • Despatch:
    •  
    • £9.99
    • Out of stock
    • 1 x 2 litre potted crocosmia plant

    • Despatch: By end of July 2016
    •  
    • £9.99
    • 2 x 1 litre potted crocosmia plants

    • Despatch:
    •  
    • £16.99
    • Out of stock
    • 2 x 2 litre potted crocosmia plants

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

Achillea filipendulina 'Coronation Gold' (Large Plant)

Yarrow

One of the very best herbaceous perennials for a mixed border, Achillea is easy to grow and a low maintenance plant. 'Coronation Gold' is a popular variety, which has flat heads of golden-yellow flowers over a long summer period.

Achillea loves a hot, sunny border and will add colour to your summer garden for a minimum of effort. The flower heads are incredibly eye-catching and plants are quick to establish, filling a gap in the border. Height: 1m (39"). Spread: 50cm (20").

 

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

    • Despatch: By end of July 2016
    •  
    • £9.99
    • 2 x 1 litre potted achillea plants

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

Hosta undulata var. undulata (Large Plant)

Hosta 'Mediovariegata', Hosta 'Argentea Variegata', Plantain Lily

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 July 2016
    •  
    • £9.99
    • 2 x 2 litre potted hosta plants

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

Hosta sieboldiana var. elegans (Large Plant)

Plantain Lily

Hostas are easy to grow ground cover for shady borders or for growing on pots on shaded patios. Hosta sieboldiana var. elegans is an RHS Award of Garden Merit holder, which is strong-growing, clump-forming. Hosta plants will thrive in moist, damp, dark borders, or difficult, dry shady borders.

The Giant Blue Hosta has architectural, blue-green foliage, which is great for the shaded end of cottage garden borders. In the summer, the robust growth plays host to pale lilac, bell-shaped flowers appear on stems held above the foliage. Height: 100cm (39"). Spread: 120cm (48").

 

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

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

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

Liatris spicata (Large Plant)

Liatris callilepis, Gayfeather

A showy, yet easy to grow plant, Liatris spicata offers plumes of mauve florets, which make a colourful display in late summer. Plants are excellent for attracting clouds of bees and butterflies to the nectar rich flowers.

Gayfeather as it is commonly known, is a resilient and undemanding perennial for almost any part of the garden. The blooms also make a bold cut flower for vases indoors. Height: 150cm (60"). Spread: 45cm (18").

 

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

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

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

Agapanthus 'Glenavon' (Large Plant)

African Blue Lily

A particularly pretty African Blue Lily that deserves a prominent spot in your garden. Agapanthus 'Glenavon' produces dense, rounded umbels of pale blue flowers with a violet stripe along each petal. The sturdy stems each rise to 1m (3') above clumps of linear, semi evergreen foliage that makes useful groundcover. This hardy perennial is tough and reliable, coping well in most soils and at its best in a sunny position. Plant it in large clumps toward the middle of borders for a superb impact from July to September. Height: 100cm (39"). Spread: 50cm (20").

 

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

    • Despatch: By end of September 2016
    •  
    • £17.99
    • 2 x 3 litre potted agapanthus plants

    • Despatch: By end of September 2016
    •  
    • £27.99

Hypericum perforatum (Large Plant)

St. John's Wort

This hardy perennial makes an excellent addition to wild flower gardens. The golden star shaped flowers appear at the tips of upright stems throughout summer. Commonly known as St. John’s Wort, Hypericum perforatum is best known for its use as an anti-depressant in complementary medicine. This interesting plant is one of the less cultivated Hypericums in UK gardens and rarely available in garden centres. Height: 100cm (39"). Spread: 60cm (24").

 

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

    • Despatch: By end of July 2016
    •  
    • £9.99
    • 2 x 1 litre potted hypericum plants

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

Knautia macedonica 'Melton Pastels' (Large Plant)

Macedonian Scabious, Scabiosa rumelica

Commonly known as the Macedonian Scabious, this pretty blend of Knautia bears fabulous pincushion flowers on slender, airy stems. Flowering over a long period from July right through to October, Knautia macedonica 'Melton Pastels' is well loved for its gentle shades of pink, rose and crimson. This hardy perennial is often found in cottage gardens where its swaying stems create an informal display. Try planting it in wildlife areas where pollinating insects will love its nectar rich blooms. Height: 1cm (39"). Spread: 45cm (18").

 

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

    • Despatch: By end of July 2016
    •  
    • £9.99
    • 2 x 1 litre potted knautia plants

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

Lysimachia ephemerum (Large Plant)

Loosestrife

Ghostly flower spikes packed with starry white blooms rise above clumps of silvery green foliage. Despite its qualities, this particular species of loosestrife is seldom seen in UK gardens. This elegant perennial enjoys a boggy position at the edge of ponds and streams, or in moist borders and bog gardens. Awarded an RHS AGM for its garden performance, Lysimachia ephemerum makes a pleasing cut flower and is always busy with butterflies. Height: 100cm (39"). Spread: 30cm (12").

 

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

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

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

Pennisetum viridescens (Large Plant)

Fountain Grass

Fountain Grasses will always add a certain elegance to any garden, large or small. The evergreen leaves arch gracefully back to allow the tall stems of the flowerheads to push upwards. Atop each stem appear long, feathery plumes, each flushed with black, which will catch the wind and add movement to your display, or, if standing still will be an interesting and delicate architectural plant. Very easy to grow, Pennisetum viridescens, require very little looking after and can be used either as a specimen plant or as part of a grasses collection. Height: 100cm (39"). Spread: 100cm (39").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 3.6 litre potted pennisetum plant

    • Despatch: By end of July 2016
    •  
    • £12.99
    • 2 x 3.6 litre potted pennisetum plants

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