Delphinium: Grow It Right, Know the Risks

Delphinium, often called larkspur, gives gardens tall spikes of dramatic color—blues, purples, pinks, and whites. People plant it for vertical interest and cut flowers. That said, delphinium isn’t a casual plant: every part of it contains toxic compounds. Treat it like a beautiful item that needs sensible handling around kids, pets, and livestock.

Want it in your border? Pick a sunny spot with rich, well-draining soil. Delphiniums like consistent moisture while they’re growing but don’t tolerate waterlogged roots. Add compost before planting and use a balanced fertilizer in early spring. Many varieties get tall and need staking; do this early so stems don’t snap. Cut spent flower spikes to encourage more blooms, and expect the main show in late spring to early summer in most climates.

Practical care and propagation

Start from nursery plants for a faster bloom, or sow seed in late winter under cover. Seedlings need even moisture and protection from harsh sun until established. Divide clumps every few years to keep plants vigorous. Watch for common pests like slugs and aphids—hand-pick slugs and spray aphids with a gentle stream of water or an insecticidal soap when needed. If fungal leaf spots appear, improve air circulation and avoid overhead watering.

For cut flowers, harvest early in the morning when stems are firm. Recut stems and place them in clean water with a floral preservative if you want longer vase life. When dealing with spent stems, snip them at the base and dispose of clippings carefully so curious animals won’t eat them.

Safety: what to watch for and first aid

Delphinium toxicity can cause nausea, vomiting, abdominal pain, drooling, weakness, and confusion. Larger exposures may affect heart rate and breathing. Horses are highly sensitive—grazing can be fatal—so don’t plant where livestock can reach it. Dogs and children who chew leaves or flowers may show symptoms quickly.

If someone or a pet eats part of a delphinium, call your local poison control center or your veterinarian immediately. Don’t try home remedies beyond rinsing the mouth. If the person is having trouble breathing, is very drowsy, or shows cardiac signs, go to the emergency room right away. For gardeners, wearing gloves while pruning and washing hands after handling are simple ways to reduce risk.

If you love the look but worry about safety, position delphinium behind lower, non-edible plants or inside fenced beds. Clearly label plants so visitors know not to touch or taste them. And remember: delphinium is ornamental, not medicinal—don’t try to use it as a home remedy.

With sensible placement, basic protective habits, and a little garden care, delphinium rewards you with striking blooms and dramatic structure—just keep it out of reach and you’ll get the beauty without the trouble.