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. Use the selections in the left menu to select the right plants for your garden.


For beautiful summer flowers browse our range of annual plants.



We have found 9 products.
 

Hollyhock rosea 'Pleniflora' (Large Plant)

Alcea rosea, Althaea rosea

Hollyhocks are classic cottage garden perennials. They provide spires of ruffled, pompom blooms, which are excellent for adding colour and height to summer borders. Plant Hollyhock 'Pleniflora' at the back of borders where their striking blooms will tower over lower growing plants. Height: 180cm (71"). Spread: 60cm (24").

Culinary note: Some parts of these flowers are edible. For more details about edible flowers click here.

More info
    • 1 x 1 litre potted hollyhock plant

    • Despatch: By end of September 2015
    •  
    • £9.99
    • 2 x 1 litre potted hollyhock plants

    • Despatch: By end of September 2015
    •  
    • £16.99

Verbascum olympicum (Large Plant)

Verbascum longifolium var. pannosum, Olympian Mullein

For almost instant impact in cottage garden borders, look no further than Verbascum olympicum. This imposing perennial will fill a gap in hot dry borders and makes a spectacular focal point, growing to 2 metres in next to no time! The felted, silver rosette of basal foliage plays host to tall spikes of buttery-yellow flowers. Verbascum olympicum is a relatively short lived perennial, which tends to bloom in its third year, and often dies after its spectacular display. However this Mullein is a vigorous self-seeder so you can look forward to plenty of new seedlings popping through the soil to take its place.

This low maintenance perennial is an excellent summer addition to borders, performing best in poor soils where many other plants would struggle to establish. A low maintenance Mullein for cottage gardens and wildlife gardens. Height: 2m (6.6'). Spread: 60m (24").

More info
    • 1 x 1 litre potted verbascum plant

    • Despatch: By end of September 2015
    •  
    • £9.99
    • 2 x 1 litre potted verbascum plants

    • Despatch: By end of September 2015
    •  
    • £16.99

Lobelia cardinalis 'Queen Victoria' (Large Plant)

Cardinal Flower, Lobelia fulgens, Lobelia splendens

Tall spikes of deep maroon foliage topped by glowing scarlet blooms bring a welcome splash of late summer colour, when many flowers have already faded. This exotic looking, short lived perennial is ideal for filling gaps in damp borders, and looks spectacular planted beside ponds and streams. Height: 90cm (36"). Spread: 30cm (12"). More info
    • 1 x 1 litre potted lobelia plant

    • Despatch: By end of April 2016
    •  
    • £9.99
    • 1 x 3 litre potted lobelia plant

    • Despatch: By end of September 2015
    •  
    • £12.99
    • 2 x 1 litre potted lobelia plants

    • Despatch: By end of April 2016
    •  
    • £14.99
    • 2 x 3 litre potted lobelia plants

    • Despatch: By end of September 2015
    •  
    • £19.99

Penstemon 'Appleblossom' (Large Plant)

This pretty little Penstemon bears pale pink, tubular flowers with white throats, above glossy, narrow foliage. Penstemon 'Appleblossom' is semi-evergreen, with a neat, bushy habit that sits nicely towards the front of perennial borders. This popular variety is easy to grow and holds an RHS AGM for its superb garden performance. Height and spread: 60cm (24"). More info
    • 1 x 1 litre potted penstemon plant

    • Despatch: By end of May 2016
    •  
    • £9.99
    • 1 x 2 litre potted penstemon plant

    • Despatch: By end of September 2015
    •  
    • £12.99
    • 2 x 1 litre potted penstemon plants

    • Despatch: By end of May 2016
    •  
    • £14.99
    • 2 x 2 litre potted penstemon plants

    • Despatch: By end of September 2015
    •  
    • £19.99

Cerinthe major 'Purpurascens' (Large Plant)

Honeywort

 Customer Rating
Also known as Honeywort, this unusual annual bears rounded, blue-green leaves on slender, upright stems. From late spring onwards masses of nodding, rich purple flowers, surrounded by blue-purple bracts appear at the stem tips, which are highly attractive to bees. With a bushy habit, Cerinthe major ‘Purpurascens’ is a fantastic addition to annual beds or used to fill gaps in herbaceous borders, where it is happy in any well drained soil. Height: 60cm (24"). Spread: 45cm (18").
More info
    • 1 x 1 litre potted cerinthe plant

    • Despatch: By end of May 2016
    •  
    • £9.99
    • 2 x 1 litre potted cerinthe plants

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

Delphinium 'Magic Fountains Mixed' (Large Plant)

Majestic spires of white, lilac and blue delphinium flowers in a blend of no less than seven shades! This compact dwarf variety has all the presence of its taller cousins without the need for staking. The perfect solution for adding colour and structure to cottage garden perennial borders, even in windy areas. You can even cut some of their regal blooms for a striking flower arrangement indoors. Height: 90cm (36"). Spread: 45cm (18"). More info
    • 1 x 1 litre potted delphinium plant

    • Despatch: By end of September 2015
    •  
    • £9.99
    • 2 x 1 litre potted delphinium plants

    • Despatch: By end of September 2015
    •  
    • £14.99

Hollyhock 'Crème de Cassis' (Large Plant)

Alcea rosea, Althaea rosea

Hollyhocks are a cottage garden essential, bringing height and stature to the back of perennial borders. Hollyhock 'Crème de Cassis' is particularly mouth-watering with veined flowers in juicy blackcurrant that fade to paler berry shades around the edges. Each vertical stem bears a fascinating mix of double, semi double and single blooms. Hollyhocks make handsome cut flowers for summer bouquets. The nectar rich blooms are also a magnet for butterflies. Height: 200cm (79"). Spread: 60cm (24"). More info
    • 1 x 1 litre potted hollyhock plant

    • Despatch: By end of March 2016
    •  
    • £9.99
    • 2 x 1 litre potted hollyhock plants

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

Hollyhock 'Nigra' (Large Plant)

Alcea rosea, Althaea rosea

Superbly dramatic; the tall spires of Hollyhock ‘Nigra’ bear dark maroon-black flowers with pale contrasting eyes. This impressive variety of an old garden favourite is sure to draw attention for its stature and colour. Try growing it alongside paler varieties for a really striking contrast. These hardy perennials make a beautiful cut flower for a vase indoors too. Height: 200cm (79"). Spread: 60cm (24"). More info
    • 1 x 1 litre potted hollyhock plant

    • Despatch: By end of March 2016
    •  
    • £9.99
    • 2 x 1 litre potted hollyhock plants

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

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"). More info
    • 1 x 1 litre potted lobelia plant

    • Despatch: By end of April 2016
    •  
    • £9.99
    • 2 x 1 litre potted lobelia plants

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