delphinium

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.

delphinium
Photo: Reinhold Möller Ermell · CC BY-SA 4.0

Delphiniums through the year

JanFebMarAprMayJunJulAugSepOctNovDec
Planting
Flowering
15913172125293337414549
  • planting
  • flowering

In short

Planting
from March to May
weeks 10 to 22
Flowering
from June to July
weeks 23 to 30
Propagation
division, cuttings and seed

Growing conditions

🪨
Soil
loamy
☀️
Sun
full sun
💧
Water
moderate water
❄️
Frost
overwinters outdoors
📏
Height
30 to 91 cm
⚠️
Toxicity
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.

Slugs and snails

pest
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.

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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.