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 22 products.
 

Astilbe japonica 'Washington' (Large Plant)

False Goatsbeard

Astilbe are long-lived perennials, which are excellent for moist, shady corners in sun or dappled shade. 'Washington' is a particularly choice Astilbe, with pure white plumes, which appear from early summer. Plants are very rabbit resistant, and attractive to a range of different butterflies.

Astilbe are an excellent plant for cottage garden borders, or can be grown in containers for summer colour. Ensure soil is moist at all times. Height: and Spread: 50cm (19").

 

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

    • Despatch:
    •  
    • £9.99
    • Out of stock
    • 1 x 3.5 litre potted astilbe plant

    • Despatch: By end of August 2016
    •  
    • £12.99
    • 2 x 1 litre potted astilbe plants

    • Despatch:
    •  
    • £16.99
    • Out of stock
    • 2 x 3.5 litre potted astilbe plants

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

Lythrum salicaria 'Robin' (Large Plant)

Purple Loosestrife

Purple Loosestrife is an easy to grow, hardy perennial for moist borders in full sun. Lythrum salicaria 'Robin' can be extremely long-flowering, with upright flower spikes from late spring to late summer.

Lythrum plants are showy and robust, with magenta pink flowers and are excellent for cottage garden borders. They offer unrivalled summer colour. Height: 90cm (36"). Spread: 45cm (18").

 

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

    • Despatch: By end of August 2016
    •  
    • £9.99
    • 2 x 1 litre potted lythrum plants

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

Waldsteinia ternata (Large Plant)

Siberian Waldsteinia

A groundcover semi-evergreen perennial that forms a dense mat of shiny purple-green leaves that somewhat resemble those of a strawberry. Waldsteinia ternate are shade loving plants and from early spring until late summer, small yellow saucer-shaped flowers appear. Uses vary from covering large or small areas as these plants spread steadily but are not considered invasive. Once established, Waldsteinia become drought tolerant and, if a mild winter is forecast, may remain evergreen too. Height: 10cm (4"). Spread: 100cm (39").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 9cm potted waldsteinia plant

    • Despatch: By end of August 2016
    •  
    • £7.99
    • 2 x 9cm potted waldsteinia plants

    • Despatch: By end of August 2016
    •  
    • £11.99

Lychnis viscaria 'Splendens Plena' (Large Plant)

Campion, Catchfly

This low growing Lychnis makes a colourful addition to moist rockeries, bog gardens and waterside plantings. Panicles of magenta pink blooms rise upon sticky, branchless stems in early summer, above clumps of narrow, linear foliage. Lychnis viscaria 'Splendens Plena' is an attractive yet under-used hardy perennial which also holds an RHS AGM for its garden performance. Height: 120cm (48"). Spread: 30cm (12").

 

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

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

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

Lychnis chalcedonica (Large Plant)

Maltese Cross, Jerusalem Cross

This stiff, upright perennial makes quite a show! Clusters of scarlet star-shaped flowers perch upon tall, stiff stems throughout midsummer, bringing height and vibrancy to the back of sunny borders. Lychnis chalcedonica enjoys a damp, boggy environment and makes a fine addition to bog gardens and the edge of ponds and streams. Commonly known as Maltese Cross, this hardy perennial also holds an RHS AGM. Height: 120cm (48"). Spread: 30cm (12").

 

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

    • Despatch: By end of August 2016
    •  
    • £9.99
    • 2 x 1 litre potted lychnis plants

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

Iris ensata 'Collection'

Japanese Iris, Iris kaempferi

Spectacular, exotic blooms are carried above narrow, strap-like foliage in summer. Iris ensata enjoy a reliably moist soil and positively thrive in bog gardens or at the margins of a pond or stream. The long stems of these low maintenance perennials also make them ideal for cutting for an eye-catching vase indoors. Height: 90cm (36"). Spread: 30cm (12"). More info
    • 4 bare root Iris plants

    • Despatch:
    •  
    • £13.99
    • Out of stock
    • 8 bare root Iris plants

    • Despatch:
    • SAVE *£8.99  
    • £27.98 £18.99
    • Out of stock

Astilbe japonica 'Montgomery' (Large Plant)

False Goatsbeard

Astilbe japonica 'Montgomery' has deep, scarlet-red plumes from early summer, set against bronze-green foliage. These hardy perennials grow well in sun or shade, and are ideal for cottage garden borders or patio pots. If you're looking for a plant for a damp, shady corner that can cope with soil that may be waterlogged occasionally, then make Astilbe your choice. Astilbe plants are bushy and easy to maintain, and are rabbit resistant. Height: 70cm (28"). Spread: 45cm (18").

 

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

    • Despatch:
    •  
    • £9.99
    • Out of stock
    • 2 x 1 litre potted astilbe plants

    • Despatch:
    •  
    • £16.99
    • Out of stock

Arum Lily (Large Plant)

Zantedeschia aethiopica, Calla Lily

Grow the classic Arum Lily in your own garden; plants are suitable for moist borders or large patio pots. The architectural foliage is joined by unusual hooded flowers, which are up to 15cm (6") in length.

Zantedeschia can be grown at the edge of ponds, or in soil that is consistently moist. The Arum Lily will flower from early summer, and is a hardy perennial in most areas of the UK. Height: 90cm (36"). Spread: 60cm (24").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
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    • 1 x 3 litre potted arum lily plant

    • Despatch:
    •  
    • £11.99
    • Out of stock
    • 2 x 3 litre potted arum lily plants

    • Despatch:
    •  
    • £19.99
    • Out of stock

Trollius 'Dancing Flame'

Globeflower

Add some heat to your border this autumn with Trollius 'Dancing Flame'. This Globeflower has everything you'd want from a border perennial; contained vigour, long flowering habit, care-free attitude, and years of garden performance! The glorious orange blooms just keep on coming right though early summer for 8 weeks of vibrant colour. This hardy herbaceous perennial thrives in moist soils but will cope with drought conditions once established. Height: 60cm (24"). Spread: 50cm (20"). More info
    • 1 x 9cm potted trollius plant

    • Despatch:
    •  
    • £9.99
    • Out of stock
    • 2 x 9cm potted trollius plants

    • Despatch:
    •  
    • £16.99
    • Out of stock

Lobelia x speciosa 'Fan Mixed' (Large Plant)

Lobelia x gerardii

Generally grown as a biennial, Lobelia x speciosa 'Fan Mixed' bears upright flower spikes of narrow-petalled flowers in shades of crimson, mauve and pink. Flowering from late summer into autumn, the blooms are perfectly complemented by the dark bronze-green foliage. This eye-catching Lobelia enjoys moist, even boggy conditions, making it a pleasing specimen for planting at a ponds edge or damp herbaceous borders. Height: 60cm (24"). Spread: 23cm (9").

 

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

    • Despatch:
    •  
    • £9.99
    • Out of stock
    • 2 x 1 litre potted lobelia plants

    • Despatch:
    •  
    • £14.99
    • Out of stock