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 21 products.
 

Salvia nemorosa 'Marcus' (Large Plant)

Salvia are effortless, hardy plants for mixed borders. Salvia nemorosa 'Marcus' is a particularly special selection, with deep indigo flower spikes above clumps of aromatic foliage, the blooms coming in such density that they create a solid block of colour.

Salvia plants are deer resistant, rabbit resistant, and will attract bees and butterflies to your garden. Salvia 'Marcus' is short, neat and will make a strong feature towards the front of cottage garden borders and wildlife gardens. Trimming the plants in midsummer will encourage even more flowers! Height: 45cm (18"). Spread: 45cm (18").

More info
    • 1 x 1 litre potted salvia plant

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

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

Verbena bonariensis 'Lollipop'

Glandularia, Verbena patagonica

 Customer Rating
  • Unique mini Verbena for your patio
Like its parents, Verbena bonariensis 'Lollipop' boasts the same tight clusters of floating purple flowers, but has short, compact stems that reach only half the height. Well shaped, uniform plants with an open airy habit attract butterflies to their glowing blooms from June to September. This fabulous hardy dwarf verbena is perfectly proportioned for patio pots and the front of borders where it creates a wonderful delicate airy effect. Height and spread: 60cm (24").
More info
    • 3 verbena jumbo plug plants

    • Despatch: By end of September 2015
    •  
    • £9.99
    • 6 verbena jumbo plug plants

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

Agastache 'Summer Glow' (Large Plant)

Giant Hyssop

This fantastic perennial is one of the best slug-proof plants for your garden. Slugs and snails dislike the felted, minty-fragranced foliage, so plants are left completely untouched.

Agastache are compact, evergreen plants, with colour-changing flowers, which are loved by bees and butterflies. Agastache plants are also very drought tolerant, and are can be grown in the border or patio pots. Height: 60cm (24"). Spread: 45cm (18").


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

More info
    • 1 x 1 litre potted agastache plant

    • Despatch: By end of August 2015
    •  
    • £9.99
    • 2 x 1 litre potted agastache plants

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

Campanula 'Mixed'

Bellflower

  • Exclusive collection
A robust mix of Campanula plants bearing semi-double, cup-shaped blooms in shades of white, purple and blue. These pretty flowers are borne in abundance on tall, slender stems from May to July, making a wonderful addition to the middle of perennial borders. Campanula 'Mixed' is ideal for creating drifts of summer colour in cottage garden borders where it will return year after year. Height: 75cm (30"). Spread: 45cm (18").
More info
    • 3 x 7cm potted campanula plants

    • Despatch: By end of August 2015
    •  
    • £19.99
    • 6 x 7cm potted campanula plants

    • Despatch: By end of August 2015
    • SAVE £14.99  
    • £39.98 £24.99

Aster ericoides 'Schneetanne' (Large Plant)

Crinitaria, Microglossa

Heath Aster is a pretty little plant, which is hugely attractive to butterflies, and perfect for the wildlife garden. The prostrate, semi-trailing habit of Aster ericoides 'Schneetanne' is great for ground cover on banks and in borders.

Asters are perfect for keeping the garden colourful and interesting, as they provide welcome autumn colour, when all the summer bedding has faded. Height: 50cm (19"). Spread: 1m (39").

More info
    • 1 x 1 litre potted aster plant

    • Despatch: By end of August 2015
    •  
    • £9.99
    • 2 x 1 litre potted aster plants

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

Melittis 'Royal Velvet Distinction' (Large Plant)

Bastard Balm

Melittis 'Royal Velvet Distinction' is an easy to grow, hardy plant for those damp shady corners of the garden. The aromatic foliage is honey-scented and, along with the orchid-like pink and white flowers, attracts bees and butterflies to the garden. Melittis is very easy to establish, and makes robust ground cover for woodland gardens and shaded borders. Height: 70cm (28"). Spread: 50cm (20"). More info
    • 1 x 1 litre potted melittis plant

    • Despatch: By end of August 2015
    •  
    • £9.99
    • 2 x 1 litre potted melittis plants

    • Despatch: By end of August 2015
    •  
    • £16.99
    • 2 x 2 litre potted melittis plants

    • Despatch:
    •  
    • £16.99
    • Out of stock

Penstemon 'Juicy Grape'

This popular hardy perennial deserves a prime spot in the garden. Wide trumpet shaped flowers in a fruity shade of purple appear in summer above a flush of glossy, semi-evergreen foliage. The long-lasting blooms of Penstemon 'Juicy Grape' continue well into autumn, long after other plants have run out of steam. Undemanding and easy to grow, Penstemons tolerate almost any position in the garden, regardless of rain or drought, and even resist slug damage. What more could you ask of a plant? Height: 60cm (24"). Spread: 45cm (18").
More info
    • 3 penstemon Postiplug plants

    • Despatch: By end of August 2015
    •  
    • £9.99

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").

More info
    • 1 x 1 litre potted achillea plant

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

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

Perovskia 'Blue Spire' (Large Plant)

Russian Sage

Perovskia ‘Blue Spire' is an easy maintenance plant, which is particularly at home in a bright, sunny border. Plants of Russian Sage are drought resistant, and will establish quickly and easily, and are ideal for beginners and first time gardeners. They can also be grown in coastal areas quite successfully.

The foliage of Perovskia is silvery and aromatic, and plants will look fantastic when planted en masse. The blue flowers combine well, and are useful for colour later in the summer. Plants of Russian Sage are loved by bees and butterflies, and ‘Blue Spire' also holds an RHS Award of Garden Merit. Height: 120cm (48"). Spread: 1m (39").

More info
    • 1 x 3.5 litre potted perovskia plant

    • Despatch: By end of August 2015
    •  
    • £10.99
    • 2 x 3.5 litre potted perovskia plants

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

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 August 2015
    •  
    • £9.99
    • 2 x 1 litre potted verbascum plants

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

Ajuga reptans 'Party Colour' (Large Plant)

Bugle

Bugle is an easy to grow, evergreen carpeting plant, which can be grown in awkward, shady corners. Plants are entirely maintenance-free, and have pretty foliage and spikes of electric-blue flowers in summer.

Ajuga 'Party Colors' has distinctive, multi-coloured foliage, which gives all year round interest in the garden. Bugle plants are the perfect choice for shady corners of the garden, whether moist or dry, and the thick carpet of growth will help to stop weeds coming through. Height: 20cm (8"). Spread up to 50cm (20").

More info
    • 1 x 1 litre potted ajuga plant

    • Despatch: By end of August 2015
    •  
    • £9.99
    • 2 x 1 litre potted ajuga plants

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

Nepeta 'Patchwork Mixed'

Catmint

  • Splashes of colour, perennial too!
A new twist on a classic cottage garden plant! Nepeta ‘Patchwork Mixed' has neat, compact growth that makes it perfect for summer bedding and patio pots. Catmint is well loved by gardeners and their cats for its sweet, pungent aroma and hazy pink and blue flowers. This hardy little perennial has a loose, relaxed habit that makes it perfect for creating soft, informal displays. Height and spread: 40cm (16").
More info
    • 24 nepeta plug plants

    • Despatch: By end of March 2016
    •  
    • £12.99
    • 48 nepeta plug plants

    • Despatch: By end of March 2016
    •  
    • £17.99