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 21 products.
 

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 September 2016
    •  
    • £9.99
    • 2 x 1 litre potted lychnis plants

    • Despatch: By end of September 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

Pachysandra terminalis 'Green Carpet' (Large Plant)

Pachysandra terminalis 'Green Carpet' is an excellent plant for creating a carpet of green beneath trees and shrubs. Plants are mat-forming, and excellent at stopping weeds from taking hold. The evergreen foliage is textured, decorative and plays host to spikes of misty white flowers from early summer.

Easy to grow ground cover for awkward, shady borders, Pachysandra is the perfect choice for low-maintenance gardening. Plants stay low at just 15cm (6") and are ideal for small, oddly-shaped areas, edgings or patio containers. Height: 15cm (6"). Spread: up to 1m (39").

 

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

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

    • Despatch:
    •  
    • £16.99
    • Out of stock

Astilbe japonica 'Elisabeth van Veen' (Large Plant)

False Goatsbeard

Astilbe can be the perfect choice for damp, shady corners on soil that may be waterlogged from time to time. Plants are bushy and easy to maintain. 'Elisabeth van Veen' has beautiful, raspberry-purple plumes from early summer.

Astilbe can grow in sun as well as dappled shade, and make an excellent addition to mixed cottage garden borders, or can be grown as a patio plant for summer colour. Height: and Spread: 50cm (19").

 

Lifetime Guarantee on Hardy Plants Large Potted Plant Special Offer
More info
    • 1 x 3.5 litre potted astilbe plant

    • Despatch: By end of September 2016
    •  
    • £12.99
    • 2 x 3.5 litre potted astilbe plants

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

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
More info
    • 1 x 3 litre potted arum lily plant

    • Despatch: By end of September 2016
    •  
    • £11.99
    • 2 x 3 litre potted arum lily plants

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

Rodgersia aesculifolia (Large Plant)

A robust plant for growing in the edge of ponds, or for moist, waterlogged borders. Rodgersia plants are highly exotic-looking, and carry large leaves that look very similar to the foliage of the horse chestnut tree! Rodgersia aesculifolia is clump-forming, and the large leaves joined by spikes of pink-flushed blooms on 2 foot stems. A border full of Rodgersia, Hosta and Ferns is a joy to behold! Height: 2m (6.6') Spread: 1m (39").

 

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

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

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

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