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Keeping you updated – Thompson & Morgan is operating as usual, working 24/7 to keep the country gardening. We are working closely with nurseries and growers to ensure that millions of plants are not wasted. Our site features many of these offers and we will add more every day, passing on these amazing deals to our customers.

Under £20, Blue, Perennial

6141 products, 777 articles, 855 blogs

Agastache foeniculum

1 Review

Silvery-green foliage which is scented unmistakenly of Aniseed. Flower spikes of blue appear during summer. Bees, butterflies and goldfinches love it!  More Info

  • Sun shade: Full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£3.29

within 21 working days

Linum narbonense 'Heavenly Blue'

4 Reviews

One of the finest blue flowered plants. A profusion of luminous ultra-marine blue flowers  More Info

  • Sun shade: Full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£3.99

within 21 working days

Platycodon grandiflorus 'Fuji Blue'

1 Review

A charming herbaceous perennial with a low, spreading habit, reminiscent of the better known perennial, Campanula. This free flowering variety makes a great choice for rockeries or at the front of perennial borders. It is commonly known as the Balloon Flower for its…  More Info

  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£8.49

by the end of november 2020

Catananche caerulea 'Amor Blue'

0 Reviews
  • Sun shade: full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£0.99

within 21 working days

Mr. Men™ Little Miss™ Salvia patens

0 Reviews
  • Sun shade: full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£2.99

within 21 working days

Heteropappus meyendorfii 'Blue Knoll'

8 Reviews

Seed of this amazing new garden plant can be sown early in the year* and by the same autumn will be completely smothered in hundreds and thousands of shiny, light reflecting flowers, forming perfect mounds (or knolls) 30cm (12in) high and 45cm (18in) across. During a…  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£1.79

within 21 working days

Corydalis flexuosa 'Purple Leaf'

0 Reviews

Corydalis flexuosa 'Purple Leaf' makes an often admired, unusual garden plant. These Corydalis may look delicate, but they're pretty tough, and enjoy our cool English summers. Flowering can often last from late spring until mid-summer, effortlessly forming clumps in…  More Info

  • Sun shade: Dappled shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£14.39

within 21 working days

Passiflora caerulea

42 Reviews

Popular for its exquisite flowers, Passiflora caerulea is a vigorous semi-evergreen climber with attractive lobed leaves. From summer through to autumn it produces large white flowers with a fascinating structure, including a striking ring of blue-purple filaments. The…  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

3 Options From£14.39

within 21 working days

Out of Stock

Meconopsis 'Lingholm'

331 Reviews

This captivating short lived perennial is a 'must have'! From basal rosettes of hairy leaves rise tall stems bearing spectacular, single clear blue poppy flowers, up to 10cm (4) across. Meconopsis 'Lingholm' makes a stunning feature planted en masse in woodlands, and…  More Info

  • Sun shade: Dappled shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

4 Options From£5.99

by the end of march 2021

Out of Stock

Geranium pratense 'Cloud Nine'

19 Reviews

Touted as the best double-flowered cranesbill geranium ever seen, and having its debut at RHS Chelsea Flower Show this year, 'Cloud Nine' really is a spectacular specimen. Smothered in wonderful lilac blue, double flowers twice in the season - once at the beginning of…  More Info

  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

3 Options From£5.99

within 21 working days

Out of Stock

Corydalis flexuosa 'Porcelain Blue'

61 Reviews

Exquisite, azure blue flowers rise on delicate stems above a spreading clump of finely cut, blue-green leaves. The slender, tubular flowers of Corydalis flexuosa 'Porcelain Blue' appear in spring, with a second flush in autumn.  More Info

  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£6.99

by the end of august 2020

Out of Stock

Lupin 'The Governor'

1 Review

Lupin 'The Governor' brings a contemporary look to conventional garden designs. Its striking white and purple flowers bloom vigorously from early summer onwards. A hardy perennial, Lupin 'The Governor' produces fine elegant blooms, comprising delicate clusters of…  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£13.19

within 21 working days

Out of Stock

Phlox 'Pharaoh Blue Eye'

22 Reviews

Creeping Phlox are useful for dry, sunny banks and all those places that other plants just won't grow! Plants produce an impenetrable mat of fragrant flowers; suppressing weeds and resisting drought! The detailed eye on each gleaming white is also quite striking!  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£9.99

within 21 working days

Out of Stock

Delphinium 'Summer Skies' (Pacific Hybrid)

2 Reviews

Beautiful sky-blue flowers form tall, soft spires above neat clumps of foliage. A classic cottage garden perennial, Delphinium 'Summer Skies' is perfectly at home in sunny herbaceous borders, where it's statuesque flowers add vertical interest and eye-catching colour…  More Info

  • Sun shade: Full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£14.99

within 21 working days

Out of Stock

Brunnera macrophylla 'Jack Frost'

8 Reviews

Brunnera macrophylla 'Jack Frost' produces elegant sky blue flowers in spring above neat clumps of foliage. The big heart-shaped leaves are a sparkling silver colour that will brighten up even the shadiest borders. This hardy perennial makes good groundcover and can be…  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

3 Options From£19.19

within 21 working days

Out of Stock

Brunnera 'Alexander's Great'

11 Reviews

* New in 2015If you are looking for a statement plant then try this big robust silver beauty! Easy to care for, the heavily silver-veined leaves will make a dramatic impact in borders and containers. Sprays of sky-blue flowers atop wirey stems will appear from spring.  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£11.39

by the end of september 2020

Out of Stock

Agapanthus 'Northern Star'

6 Reviews

Agapanthus 'Northern Star' is very free flowering, forming masses of umbel flower heads all through summer. The stunning deep blue flowers have a purple stripe the same as the purple base of the semi-evergreen foliage. A tall African Blue Lily, ideal in the middle of…  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

3 Options From£19.19

within 21 working days

Out of Stock

Hardy Geranium Duo (Cloud Nine + Rozanne)

0 Reviews
  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£14.99

within 21 working days

Out of Stock

Meconopsis baileyi 'Blue'

7 Reviews

Is there a more beautiful bloom in the entire flower kingdom then the famous Blue Poppy? The large bowl shaped blooms will have a dramatic effect and are certainly worth a place in your garden.  More Info

  • Sun shade: dappled shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

3 Options From£11.99

by the end of september 2020

Out of Stock

Campanula persicifolia 'Caerulea'

0 Reviews
  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£13.19

Out of Stock

Agapanthus 'Full Moon'

0 Reviews
  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£14.39

within 21 working days

Out of Stock

Veronica spicata 'Glory'

1 Review

Small in stature but big in impact! Veronica spicata 'Glory' produces lots of large purple-blue, upright flower spikes above neat clumps of foliage. Flowering in abundance from June to August, this herbaceous perennial is ideal for adding summer colour to the front of…  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£19.99

Out of Stock

Penstemon heterophyllus 'Electric Blue'

2 Reviews

Intensely blue flowers with a tinge of purple contrast beautifully with the silvery green foliage of this hardy perennial. The long lasting blooms of Penstemon heterophyllus 'Electric Blue? appear from June through to October enticing plenty of pollinating insects to…  More Info

  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

3 Options From£17.39

within 21 working days

Out of Stock

Salvia Salgoon 'Lake McKenzie'

0 Reviews

Salvia Salgoon 'Lake McKenzie' is a new introduction that?s sure to be a hit with UK gardeners. A sublime display of indigo blue flowers are borne on black stems throughout the summer. The nectar-rich blooms are loved by pollinating insects.  More Info

  • Sun shade: full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£7.99

within 21 working days

Out of Stock

Ajuga reptans 'Black Scallop'

1 Review

Bugle plants are well known for their performance in the shade, but Ajuga reptans 'Black Scallop' combines their traditional low maintenance and exceptional ground cover with a surprising tolerance of sunlight. Indeed, its green foliage develops an interesting,…  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£13.19

within 21 working days

Out of Stock

Muscari armeniacum

27 Reviews
  • Sun shade: Full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

3 Options From£4.99

Out of Stock

Veronica 'Pink Harmony'

7 Reviews

A striking architectural plant producing erect flower spikes with attractive, silver-green foliage. Veronica 'Pink Harmony' has pale pink flowers which contrast beautifully with the hot pink stamens creating a stunning 'flash' of vivid colour  More Info

  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£8.49

Out of Stock

Eryngium alpinum

1 Review

This stylish perennial, produces upright, blue stems, topped with dramatic thistle-like blooms. The flower heads are cone shaped, surrounded by a lacy collar of spiky bracts, making a superb architectural focal point in borders.  More Info

  • Sun shade: full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£6.99

by the end of november 2020

Out of Stock

Agapanthus 'Blue Ribbon'

7 Reviews

The starry, rich blue flowers of Agapanthus ?Blue Ribbon? form rounded flower heads in late summer. Each petal is marked with a violet-blue stripe that adds depth and interest to the display.  More Info

  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£14.39

Out of Stock

Pansy 'Mystique Blue Halo'

11 Reviews

Fill your beds and pots with 'Mystique Blue Halo's unique colouring. The super-sized blooms will create a dazzling, cool blue display.  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

4 Options From£7.99

Out of Stock

Viola sororia 'Freckles'

0 Reviews

Viola sororia 'Freckles' is quite unlike any other variety, bearing violet-purple, speckled flowers from spring through into summer. These unusual blooms are held above neat clumps of deep-green, heart-shaped foliage. A memorable Violet, 'Freckles' self-seeds freely,…  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£14.39

within 21 working days

Out of Stock

Commelina tuberosa

4 Reviews

Intense blue flowers. Wonderful in containers, rock gardens and the border.  More Info

  • Sun shade: Sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£9.99

by the end of january 2021

Out of Stock

Salvia patens 'Blue Angel'

0 Reviews
  • Sun shade: full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£14.99

within 21 working days

Out of Stock

Geranium pratense 'Azure Skies'

0 Reviews
  • Sun shade: sun or semi shade
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

2 Options From£11.99

Out of Stock

Delphinium elatum 'Paramo Azul'

0 Reviews
  • Sun shade: full sun
  • Grows in: Borders
  • Flower Colour: Blue
  • Longevity: Perennial

Just£9.99

by the end of august 2020

Out of Stock
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