Dig a planting hole and add compost or well-rotted manure in the bottom, for a nutritious boost. Save 30 per cent on Sunday tickets* for BBC Gardeners' World Live 2021. A lady in British Columbia, Canada grows her beautiful patio delphiniums from our seed in wooden half-barrels about 60 cm deep and 75 cm wide. Delphiniums are tall plants, so do best at the back of a sunny border. Although delphiniums have a relatively short flowering season, cutting the flower spikes back as soon as they have faded can encourage plants to produce a few later flowers. Delphiniums struggle in winter wet, so add grit to heavy soils to aid drainage. In spring, protect plants from slugs and snails – they will demolish the fresh green new growth of young delphiniums. Water thoroughly. The outer container must have good drain holes. If the plant is adequately cared for and divided as soon as it gets too big, the delphinium can thrive in a container as well. Delphinium is popular for cut flowers and cottage style gardens, but they do require a good deal of work. The results are amazing - short, stocky spikes with masses flowers on each one. Here, Monty Don explains how: Here, Monty explains how to pot on rooted delphinium cuttings: You can also grow delphiniums from seed – many varieties are available to buy from seed, or you can try saving your own. The small investment is well worth it in both results and peace of mind and saves work too. The secret to keeping cut delphinium stems looking great is to plunge the hollow stem, the moment it’s cut, into water. Plant your delphinium at the same depth it was growing in the pot, and back-fill with soil, firming in gently. With the arrival of the winter season many of us are spending more time indoors, so why not brighten up your home and purify the air with a range of wonderful and architecturally interesting indoor plants. For best results grow delphiniums in moist but well-drained soil in full sun. On a hot, breezy summer’s day a plant in full flower may need watering morning and night but it’s worth the effort. All you need to know about growing delphiniums, in this detailed Grow Guide. *Valid on standard one-day tickets only, transaction fee applies. Growing Method 2:- This is easier but takes more space. Some people use the traditional method of growing in smaller pots and potting on as required until the 8 litre size is reached. Here, Monty Don demonstrates how to cut back delphiniums after they’ve flowered: Although hardy, being herbaceous perennials, delphiniums will die back over winter. Sprinkle a few slug pellets on the plant. During those winter months it is important to keep the plant as cool as possible as winter chilling is beneficial to delphiniums. If these plants are potted up in spring they will flower magnificently in the early summer, after which there will be time left to cut away the old stem to allow a second flush before it’s too cold for lingering on the patio. We then place the ornamental container on a large, 3 or 4 cm deep saucer. The outer container must have good drain holes. Highly-scented, it was launched to a frenzy of interest at the Chelsea Flower Show 2005. Receive perfectly portioned snacks delivered straight to your door, Subscribe to BBC Gardeners' World Magazine and receive 12 issues for only £39.99 - saving 39%. You can use up to 20 litre if you wish but these are more difficult to move. Delphiniums look good in a cool-coloured planting scheme, and also work with other vertical summer flowers, such as lupins and verbascums. The flowers are also loved by bees and are great for cutting. 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