Consequently, these giants have held their popularity for over a hundred years despite being demanding plants to grow. The reason is simple. Cut to the ground after their first flowering to get a second flush August-September. They look at their best in groups of three or more, but plant seedlings 60-75cm apart to help prevent mildew. 'Celebration' - a pale-cream with a dark eye (220 cm) Harvest and saved Delphinium seeds can be used the following year to grow new beautiful flowers on from seed. Annuals, Lupins Registered in England & Wales #06694059. Read our guide to controlling slugs and snails. Delphiniums are hungry feeders, so feed again with Blood, Fish and Bone a couple of times through the summer, then again in autumn before the plants die down. For best results, grow ‘Redcap’ in full sun or dappled shade, in moist, well-drained soil For best results, grow ‘Redcap’ in full sun or dappled shade, in moist, well-drained soil Fasciation This produces flattened stems and it may be caused by a growth check due to cold weather. Delphiniums come in a wide range of colours, meaning there is a delphinium for every garden style. Delphiniums need sun to prosper and they also need fertile, enriched soil that is airy and well-drained. Delphinium Connecticut Yankees- sow seed in the fall. They are usually labelled Delphinium hybridum and you generally get ten to twelve seeds for between two and three pounds. 'Blue Nile' - a white-eyed dark blue (180 cm) The optimum temperature range for germinating delphinium seeds is 60-68° F (15-20°C). If delphiniums sit wet in their dormant winter season, they can die, so make sure you prevent this. Find out about other blue flowers for your garden, Foxgloves Mildew This water-stress disease can be prevalent in dry years but plants recover. Height: 1.5-1.7m. 'Rosy Future' (from Mr Fothergill’s) Delphiniums are top heavy plants and they need staking firmly once they reach a foot in height. Growing from seed. Thin out shoots emerging from crowns early in the season to increase air circulation and help prevent powdery mildew forming. Try 12 issues of Saga Magazine for just £12.95 and enjoy a world of benefits when you subscribe. Delphiniums can also make good cut flowers. Add plenty of organic matter to the planting hole; choose something slow-release, like Blood, Fish and Bone, or a scattering of bone meal. 'Min' - a dark-eyed lavender blue (160 cm) If growing delphiniums from seed, plant in late January in seed compost and cover with black polythene and keep at 16 C. Germination should take 10 days. Wait for the seed pods to flower and go over [see photo ] Once they have turned a dark brown colour and have dried out, if you have a wheel barrow handy which is clean simply tip the plant head with the attached seed pods … If you grow delphiniums from seed you have more options of colors from fabulous blues to blush pinks and the white delphiniums are gorgeous too. I bet if you go to Plant Files and search for delphinium and choose entries with images you can see which ones most resemble the ones you got the seeds from and go from there. Delphinium nudicaule is a short-lived hardy species, native to California. Prick out (by handling leaves) into 9cm pots. There has been an RHS seed trial and 'Pagan Purples' stood out well as did 'Double Innocence' (a green-white from Jelitto Seeds). Get 10% off at Thompson & Morgan and save on seasonal specials. If sowing outside, you may want to let the seeds germinate first. 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