If you're only going to grow one Dahlia then this is it... Deep bright, rich red flowers on sturdy upright stems of bronze-tinted foliage. Perfect Summer colour...
Darmera peltata 2ltr...£4.00
DEGENIA Brassicaceae
Degenia velebitica 7cm...£2.75
Large petalled, acid-yellow flowers held over prostrate stems of narrow silver foliage make for a pleasant combination. Sun, but not too parched.
A classy flowering shrub. Small, prickly hollyesque leaves on upright stems and striking open-ended, tubular flowers of orange-yellow. Its habit is dense and slow, ensuring it wil never outgrow its position.
An attractively variegated form; creamy-yellow and green leaves on soft stems and rich pink flowers. Surprisingly hardy.
Diascia 'Prince of Orange' 9cm...£2.50
A new selection with quite bright orange flowers on leafy stems.
Dicentra
'Bacchanal' 1ltr...£3.00
Dionysia 'Aisbett' sold out
Dionysia 'Annielle' 7cm...£4.00
A relatively easily pleased and long-lived selection; making a dense, compact cushion of small, mid-green rosettes and with the potential to cover itself in luscious, two-tone yellow flowers in early Spring. This is one of the few Dionysias I've tried outside on a sunny rock garden - grew well and looked great for seven months until end of October ! No doubt, given efficient protection when necessary, this is a distinct possibility.
Dionysia aretioides 'Bevere' 7cm...£3.50
Dionysia aretioides 'Mary Randall' sold out
An old variety with large, pale yellow flowers over a loose cushion. Not too difficult in a cold greenhouse and kept airy and dry in the Winter months.
Very compact growth with compact rosettes of slightly scented, crenulate silver-blue-green foliage and good-sized two-tone yellow flowers that sit almost stemless entirely covering the mound.
Dionysia aretioides 'Susan Hale' sold out
Another selection, this time with large, deeper yellow flowers and with a slightly more robust constitution; though still requiring careful watering and adequate air-flow to maintain good health.
Dionysia aretioides x archibaldii 7cm...£5.00
Dionysia 'Bernd Wetzel' 7cm...£5.50
Dionysia curviflora 7cm...£5.00
Dionysia curviflora x lamingtonii 7cm...£6.00
Dionysia 'Eric Watson' sold out
( D.bryoides x D.tapetodes MK9107/3 ) Forms a tight green cushion of small rosettes each of which is capable of producing a yellow-centred, violet-purple sessile flower. Quite stunning and long-lived.
Dionysia microphylla sold out
Dionysia x microphylla 7cm...£4.50
Dionysia tapetodes sold out
Tight silvery green cushions, covered in relatively large bright yellow flowers in Spring. Makes a fantastic cushion plant for the cold greenhouse.
Dipcadi serotinum 7cm...£3.00
Diselma archeri sold out
An attractive, slow-growing squat shrub with arching sprays of adpressed, dark green scale-like leaves and, though heralding from Tasmania, it is perfectly hardy. An ideal support for a delicate, twining clematis or such like.
Disporopsis fuscopicta 1ltr...£2.50
Disporopsis taiwanensis 2ltr...£4.00
Disporum cantonense 1ltr...£3.00
Pale, glossy green clumps of erect stems bear charming, drooping yellow flowers in late Spring. Part-shade in moisture-retentive soil.
Disporum sessile 9cm...£3.25
Disporum sessile 'Cricket' 8cm...£8.50
Disporum smithii 9cm...£3.00
Douglasia laevigata var. ciliolata 7cm...£2.50
A really lovely North American with narrow-leaved rosettes of blue-green foliage and small heads of several bright crimson-pink flowers on short stems. A lovely plant for a pot under glass or a sheltered gritty trough.
Dracocephalum 'Fuji Blue' 7cm...£2.50
Dracocephalum grandiflorum 9cm...£2.50
Drapetes diffenbachii sold out
A choice, prostrate alpine species from the Coromandel Mountains, New Zealand; forming tight mats with white flowers in terminal clusters. For moist, peat-bed conditions or a shady trough.
Drimys henryi sold out
Dudleya collomae 1ltr...£2.50
( North America ) This has proved to be remarkably hardy. Forms smooth, glaucous blue, succulent leaves in compact rosettes and from these appear many red stems of yellow-orange flowers. From the region including the Mojave and Sonoran Deserts in Arizona. Looks great 'toasted' in a sunny greenhouse in a gritty, sandy compost.
Dicentra 
Dionysia aretioides 'Bevere' 7cm...£3.50