1.2m. Pink buds, opening to white flowers, all summer. Fertile, well-drained soil in sun. Tolerates drought and part shade.

10cm. Low sprawling shrub, with masses of yellow flowers in early summer. Very attractive to bees. Well-drained soil in sun. I believe it's a British Native.

40cm. Strongly veined, deep pink flowers.

30 x 30cm. Numerous pink or white flowers in summer, over a mound of foliage. Moderately fertile, well-drained soil in sun or part-shade.

25cm. Small pale blue flowers in late spring.

Sorry, none available this year

45cm. Lavender-pink flowers in summer. Well-drained soil in sun.

30-45cm. Good soft pink flowers in summer. Moderately fertile, well-drained soil in sun or part-shade.

30-45cm. Large purple flowers in mid-summer. Spreads. Moderately fertile, well-drained soil in sun or part shade.

30-45 x 80cm. Large white flowers, veined purple, all summer. Moderately fertile, well-drained soil in sun or part-shade.

15 x 50cm. Neat mounds of glossy aromatic foliage, colouring in autumn. Clear shell-pink flowers in summer. Moderately fertile, well-drained soil in sun or part-shade. Suitable for a rock garden or front of border.

45cm. Many large deep pink flowers over a long season.

Sorry, none available this year

60cm. Pale pink flowers. Ideal for woodland garden.

Sorry, none available this year.

30cm. Large violet-blue flowers, early summer.

30-45 x 60cm. Large violet-blue flowers in early summer, then spasmodically until autumn. Moderately fertile, well-drained soil in sun or part-shade.

25cm. Double soft-lilac flowers in early summer. Fertile, humus-rich soil, not too dry. Sun or part-shade.

30cm. Semi-evergreen, aromatic foliage, purple-tinted in autumn. Magenta flowers, May to July. Good ground cover, sun or shade, even dry shade!

30-45cm. Aromatic,near-evergreen foliage. Pale pink flowers in summer. Fertile soil in sun or shade.

40-50cm. Lilac-pink flowers in early summer. Moist, humus-rich soil, not too dry, in sun or part-shade.

As above, with pale pink flowers.

20-30 x 45cm. Tuberous perennial, summer dormant. Winter foliage, then violet-blue flowers in spring. Performs best in full sun and poor soil.

60-90cm. Pale lilac flowers with dark veins, summer. Fertile soil in sun or part shade, not too dry. Cut back after flowering.

Violet-blue flowers in summer.

60cm. A smaller version of G. psilostemon.

60-90cm. Violet-blue flowers in summer. Feathery foliage, golden in spring. Fertile soil in sun or part shade. Cut back after flowering.

Sorry, none available this year.

30-50cm. Lilac flowers all summer (we select plants with good flowers). Performs well, even in dry soil in shade! Self seeds a little (some say a lot!).

30cm. Purple flowers with paler margins, early to mid-summer. Tolerates dry shade.

Lilac, darker- veined flowers. Conditions as above.

***A new introduction from Birchwood Plants in 2003. A rare and very attractive form of the above. White flowers from spring to autumn. All proceeds from the sale of this plant are given to The Motor Neurone Disease Association.

Pale bluish-purple flowers.

Swish Purple Purple flowers with paler centre.

NOT a variegated leaf, but named after the house where it was found growing! Similar to G. nodosum, but flowers are dark veined, with a pale edge.

40-60cm. Violet-blue flowers in spring. Summer dormant. Winter foliage. Sun or part shade.

Sorry, none available this year.

60-80 x 45cm. Clump-forming, with deep maroon flowers in late spring-early summer. Good ground cover in shade.

A white form of the above, with golden anthers.

70cm. A very attractive form, with large rich mauve flowers.

Low-growing, marbled yellow-green leaves. Bluish-purple flowers. Just a few plants available.

40-60cm. Delightful pink flowers, with pale central zone, flowering in spring-early summer. Full or part shade. Our own introduction in 2008.

Dark purple flowers.

60cm. Dusky pink flowers.

Flowers as G. phaeum, but foliage has striking dark markings.

70cm. Pale lavender flowers with a darker centre.

90cm. Pale lilac flowers.

Dark maroon flowers with dark stems.

30cm. Makes a neat mound of soft, blue-grey leaves, with large, bluish-purple, dark-veined flowers in summer. Well-drained soil in sun.

10-15cm. Mound of light pink flowers over a long period in summer. Well-drained soil in sun. Attracts bees.

60-90cm. Clump-forming. Mauve-blue flowers, early to mid-summer. Sun or part-shade, not too dry. Self-seeds. Cut back after flowering. British native.

60 x 30cm. A very attractive form, with pale grey-blue flowers heavily veined white, in early summer. Grows well on chalk..

60cm. White flowers, irregularly splashed and spotted with deep blue-purple. Conditions as above.

45cm. Dark foliage. Violet-blue summer flowers. Conditions as above.

60-90cm. Pale mauve-blue flowers in summer. Conditions as above.

60-120 x 60cm. Brilliant magenta, black-centred flowers all summer. Sun or part-shade. Foliage colours well in autumn.

15-25 cm. Rose-pink flowers in early summer, then becomes dormant. Spreads by tuberous underground runners. Well-drained soil, full sun.

30cm. Deep bluish-purple flowers in summer. Sun or part shade. Often short-lived, but self seeds.

45cm. This form has mauve flowers with a white eye and flowers in spring. Cut back after flowering for more flowers. Self seeds.

30 x 30cm. Excellent foliage, with clusters of white, purple veined flowers in early summer. Flowers best in well-drained, poor soil in sun.

70cm. Like a robust form of G. pratense.

20-30 x 30cm Deep pink flowers all summer. Sun or part-shade. Foliage colours well in autumn. British native.

30 x 40cm. A looser, taller plant, with white flowers.

30cm. Purplish-red flowers.

20 x 20cm. A neater plant than G. sanguineum, with bright pink flowers over a long period.

Purplish-pink flowers.

Rose pink flowers.

Sorry, none available this year.

Large purplish-red flowers.

30cm. Large rose-pink flowers.

20cm. Neat mound of foliage, with bright purplish-pink flowers in summer. Best in full sun.

10 x 30cm. We have a compact form, with pale pink, dark-veined flowers. Long flowering. Well-drained, fertile soil in full sun.

90cm. Rich purple-blue flowers in summer. Fertile soil in sun or part-shade, not too dry. Cut back after flowering.

40 x 30cm. Dusky purplish-pink flowers, darker veined, from June to October. Grows well in some shade. Fertile, humus-rich soil.

Large pure white flowers over mound of good foliage

Large plum-pink, veined flowers.

Soft pink flowers, a little later than the type, and over a longer period.

Large rich violet-blue flowers with a white eye.

Pink veined petals.

45cm. Similar to G. Phillipe Vapelle, with a mound of somewhat 'renardii' type foliage, above which are carried masses of blue-purple flowers in summer. Well-drained soil in sun.

30 x 120cm. Long trailing stems, marbled leaves, and clear blue flowers with white centres and black stamens, from mid-summer to mid-autumn. Humus-rich soil, best in part-shade.

Less vigorous than above. Flowers white,tinged pink.

Sorry, none available this year.

20-30cm. Pink flowers on a low-growing plant. The oxonianum group are mainly semi-evergreen, long-flowering geraniums, tolerant of a wide range of growing conditions, and happy in sun or part-shade. Cut back after main flush of flowers, to keep tidy and to encourage further flowering.

Thurstonianum-type flowers, pink with dark veins. Conditions as above.

30cm. Evergreen. Deep pink, veined flowers. Dark reddish markings on the leaves. Conditions as above.

45cm. Lavender-pink flowers. Conditions as above.

45cm. White flowers veined pink, rapidly turning pink. Conditions as above.

Pink flowers, darkening with age. Conditions as above.

30-40cm. Very pale pink flowers. Conditions as above.

50cm. Bright pink, veined flowers. Conditions as above.

Large pink flowers. Conditions as above.

Very large bright pink flowers. Strong grower. Conditions as above.

40cm. White flowers. Conditions as above.

40cm. Dark reddish marking in the foliage. Flowers very pale pink, veined magenta. Conditions as above.

30cm. Pearly salmon-pink flowers. Conditions as above.

20 x 60cm. From a neat rosette, trailing stems spread, bearing silvery, pale green leaves, and a long display of clear shell-pink flowers. Well-drained soil in full sun.

Sorry, none available this year.

Similar habit to Mavis Simpson, but bearing deep magenta flowers over a long period. Not quite so hardy, so protect crown in winter in colder areas.

30cm. Pale yellow, nodding flowers, mostly in spring-early summer but sometimes later as well. Prefers a moisture retentive soil, in sun or part shade.

45 cm. Large, double red flowers all summer.

80-100cm. One of my favourite plants. Attractive foliage on red-tinted stems, above which floats clouds of dainty star-shaped, white flowers with red calyces. Flowers over a long period from spring into summer. Acid-neutral soil, moist but well-drained, with some shade in the hottest part of the day.

20cm. Mat-forming, semi-evergreen perennial bearing masses of dainty white flowers in summer. Well-drained soil in full sun, preferably alkaline.

Similar to above, with light pink flowers.

40cm. Semi-evergreen, producing clouds of pale pink, double flowers in mid to late summer. Prefers well-drained, alkaline soil in full sun.