Thompson & Morgan

Important delivery notice
The products on this site are only delivered to UK addresses. If you require delivery to another country please visit one of our other sites below.

Refine Results

Refine by..

Email Newsletter

Sign up to our newsletter

Perennial & Biennial Seeds


Biennials live for 2 years, whereas perennials live for longer. As a general rule, biennial and perennial seeds should be sown in spring, but some can be sown in autumn as well. Many varieties will self-seed after flowering, giving you even more plants!

We have found 12 products.
 
Geranium Wallichianum Buxtons Blue

Geranium wallichianum 'Buxton's Blue'

Geranium wallichianum 'Buxton's Variety', Hardy Geranium, Cranesbill

 This is definitely the star of the perennial geranium family producing flowers virtually non-stop from mid summer to early autumn. The flowers themselves are a delight, a gorgeous clear opal, or Nemophila blue with large white centres, against which the dark stamens and dark veining of the petals contrast beautifully. The plant forms an attractive clump with attractive wedge shaped, silky, deeply toothed leaves, making this a very garden worthy plant even when not in flower. It also comes quite true from seed. Requirements: One of the easiest perennials to cultivate, happy in sun or light shade and any free draining garden soil. More info
    • 1 packet (8 seeds)

    • Despatch:
    •  
    • £1.49
    • Out of stock
Delphinium X Cultorum Tall Black Knight

Delphinium x cultorum 'Tall Black Knight'

Tall, robust, candle-like flower spikes packing with attractive, deep blue blooms, each complemented by a striking large black bee in the centre. A stunning addition to any border. Height: 120-150cm (4-5ft). More info
    • 1 packet (100 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.79
Aquilegia Caerulea

Aquilegia caerulea

Rocky Mountain Columbine, Colarado Blue Columbine, Granny's Bonnet
Possibly the most beautiful Aquilegia of all. With glorious light to deep blue flowers 2-3in across sometimes fetching bi-coloured with white. An excellent border perennial, grand for cutting, in bloom for several weeks and will grow in sun or light shade. Flowers late spring/early summer. Height: 30-35cm (12-14in) More info
    • 1 packet (100 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.99
Nepeta Nervosa Blue Moon

Nepeta nervosa 'Blue Moon'

Catmint
A neat, dwarf, bushy, habit, with large dense blue flower spikes, over a very long period. Quick to flower in 12-16 weeks from an April sowing. Ideal for borders and containers. Height: 30-40cm (12-16in). More info
    • 1 packet (30 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.49
Dianthus Amurensis Siberian Blues

Dianthus amurensis 'Siberian Blues'

Pink

 Compact, bushy mounds of bluish evergreen foliage erupt into a sea of mauve-blue flowers in late spring and are the closest yet to a true blue Dianthus. Ideal planted in borders, rockeries and containers, flowering over a long period each summer for many, many years.

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

 More info
    • 1 packet (25 seeds)

    • Despatch: Within 2 Days
    •  
    • £1.49
Salvia Patens

Salvia patens

Gentian Sage
A classic border plant, ideal for adding a cool blue drift to your planting schemes. The attractive, large blue hooded florets are borne on erect stems above toothed foliage. First year flowering, blooms throughout the summer into autumn. Height: 45-60cm (18-24in). More info
    • 1 packet (15 seeds)

    • Despatch: Within 2 Days
    •  
    • £3.99
Salvia Patens Cambridge Blue

Salvia patens 'Cambridge Blue'

Gentian Sage
An outstanding plant, which is a variant to the Mexican species. Exquisite large pale blue, hooded flowers on erect stems. Superb in borders, greenhouse or conservatory, and in milder areas tubers can be left outside. Otherwise simply lift plants in the autumn and store similarly to Dahlia tubers until spring, when you can plant them outside again. Height: 60-75cm (24-30 inches). More info
    • 1 packet (15 seeds)

    • Despatch: Within 2 Days
    •  
    • £3.99
Campanula Rotundifolia

Campanula rotundifolia

Harebell, Scottish Bluebell, Bellflower

 The pretty British Harebell otherwise known as the bluebell of Scotland, produces thin wiry stems of nodding pale blue flowers. An easy, charming plant for rockery, border etc. More info
    • 1 packet (1000 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.99
Lupinus Chamissonis Hybrid Silver Fleece

Lupin 'Silver Fleece'

Lupinus chamissonis

A selection made from Lupinus chamissonis. Its lovely silver grey foliage will creep and cascade through other plants in borders. Unlike the original, this selection is vigorous and hardy with gorgeous blue and white stumpy flower spikes.

If sown early, it will flower in its first year.

 More info
    • 1 packet (10 seeds)

    • Despatch:
    •  
    • £1.49
    • Out of stock
Strelitzia Nicholai

Strelitzia nicolai

Giant White Bird of Paradise

 A rarely offered robust species of Black Bird of Paradise. Beautiful bird-like blooms In white with purple - blue can take many years to bloom. Meanwhile the large exotic sword - like foliage makes a superb container plant in a conservatory. More info
    • 1 packet (7 seeds)

    • Despatch: Within 2 Days
    •  
    • £1.49

Salvia Duo

Salvia patens, Salvia patens 'Cambridge Blue', Gentian Sage
Collection includes the following varieties; Salvia patens - a classic border plant, ideal for adding a cool blue drift to your planting schemes. The attractive, large blue hooded florets are borne on erect stems above toothed foliage.
Salvia patens 'Cambridge Blue' - exquisite large pale blue, hooded flowers on erect stems. Superb in borders, greenhouse or conservatory, and in milder areas tubers can be left outside. More info
    • 2 packets - 1 of each variety (30 seeds in total)

    • Despatch: Within 2 Days
    • SAVE £1.49  
    • £7.98 £6.49
Kew : Dianthus Siberian Blues

Dianthus amurensis 'Siberian Blues' - Kew Collection Seeds

Pink

 Compact, bushy mounds of bluish evergreen foliage erupt into a sea of mauve-blue flowers in late spring and are the closest yet to a true blue Dianthus. Ideal planted in borders, rockeries and containers, flowering over a long period each summer for many, many years.

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

 More info
    • 1 packet (25 seeds)

    • Despatch: Within 2 Days
    •  
    • £2.99