General
Does well in full sun, with an evenly moist, loamy and humusy soil. Plants are frost sensitive so a protective mulch is recommended in winter. Very wet winter soils should be avoided. Will re-bloom if cut back after flowering.

Planting

Delphinium ‘Coral Sunset’ prefers a soil rich in humus and loam, but it will grow in other soil types that are moist and fertile.  For planting a Delphinium, a generous hole must be made, much larger then the pot. The soil surrounding the roots must be enriched with compost or fertilizer and pressed firmly against the roots.

It is recommended to give Delphinium a good amount of fertilizer in spring for good growth and flower development. In summer, especially after removing the first spent flower spikes, some fertilizer will help to maintain good growth.

Light and sandy soils tend to dry out easy, which must be avoided.  This can be accomplished by covering the soil with a good mulch.

This Delphinium elatum type was selected for its superb flower colour and strong stems, but not for its winter hardiness. Somewhere in its ancestry is a plant with a low tolerance for cold, and this mean sit is less hardy than other elatum types To help D. ‘Coral Sunset’ through the winter, provide a good protection like a thick mulch and ensure wet soils are avoided.

This cultivar starts to re-grow a few weeks later then other D. elatum cultivars. Therefore attention has to be paid that the plant does not become overgrown by neighboring plants.

Delphinium 'Coral Sunset's impressively large flower spikes weigh heavily on its stems, even though they are strong. They are susceptible to breakage from wind and rain and are best staked for additional support.

When the old flower stems are removed during growth season, the plant will re-bloom and will continue until it gets too cold. Some fertilizer at this time will help the plant to produce a next flush of flowers. In some cut flower production areas, like in Ecuador, D. elatum will continuously flower and will not die back.

Main pest problems in Delphinium are snails and slugs, which really can ruin your plants. It is important to keep them away especially early in the season, when they are most harmful for your plants.  Snails and slugs have an ability to find new shoots, even before they appear above the soil. There are several biological ways to deal with the problem, but slug poison is the best option if you really don't want to share your Delphiniums with slugs.

Powdery mildew, characterized by a white dusty coating on the leaves, is a common problem in Delphinium. This usually occurs at the end of the season, when the plants have stopped growing. It is not fatal, but it looks unsightly. After dormancy the plant will re-grow without a trace of mildew.

Dry soil will weaken the Delphinium and makes it more susceptible to mildew. Therefore, a mulch that keeps the soil moist is one of the easiest ways to reduce mildew. In worst cases, thinning out of shoots or transplanting to a better place might help.