When to plant delphiniums?
- Botanical name
- Delphinium
- Family
- Ranunculaceae
Delphiniums are planted from March to May. They flower from June to July.
Delphiniums are perennial plants.
Eaten, delphinium causes a burning feeling in the mouth and paralysis of breathing, and in animals heart failure as well. The leaves irritate the skin, so gloves go on for division and for taking cuttings.
Delphinium takes a severe winter and needs no cover. Water that stands at the crown in winter does the damage, so it goes in a sunny place and in free draining soil.
Faded flower stems are cut back at ground level and the plant sends up a second wave of flowers, shorter than the first. In autumn, once the leaves die back, they are cut just as low.
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Delphiniums through the year
- planting
- flowering
In short
Growing conditions
Are delphiniums toxic to cats and dogs?
Yes. Toxic to people and animals, toxic parts: stems, leaves, flowers and seeds.
Pests and diseases
Listed here is every problem for which the sources name this plant as a host. The problems are not listed in order of how common they are.
- Signs
- Holes appear in the middle of the leaf rather than along the edge, young plants are eaten down to the ground, and there are slimy trails in the morning. On low-growing fruit there are gnawed pits.
- Prevention
- Remove the hiding places beside the bed: boards, stones, dense weeds. Water in the morning and not in the evening, so that the night is dry. Spread a band of coarse sand or gravel around the bed. Cover young plants with fleece. Pick them off at night, which is still the most effective measure.
- What to do
- Baits with iron phosphate are held to carry less risk for pets and children. Put them out in bands beside the bed, not scattered over the whole surface.
Check the registration and the label before use.
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Related plants
The plant below is in the same botanical family (Ranunculaceae).
Sources about the plant: ASPCA Toxic and Non-Toxic Plants, GBIF Backbone Taxonomy, NC State Extension Plant Toolbox, Royal Horticultural Society, Wikidata. Checked between 14 and 28 August 2026. The problem descriptions also draw on: University of Maryland Extension, University of Wisconsin-Madison Division of Extension.