North America Non-native Plant

Delphinium Formosum

Botanical name: Delphinium formosum

USDA symbol: DEFO4

Native status: Not native but doesn't reproduce and persist in the wild

Delphinium formosum: A Mysterious Beauty in the Garden World If you’ve come across the name Delphinium formosum in your gardening adventures, you might be scratching your head trying to find solid information about this particular plant. Well, you’re not alone! This botanical name presents quite the puzzle for gardeners and ...

Delphinium formosum: A Mysterious Beauty in the Garden World

If you’ve come across the name Delphinium formosum in your gardening adventures, you might be scratching your head trying to find solid information about this particular plant. Well, you’re not alone! This botanical name presents quite the puzzle for gardeners and plant enthusiasts alike.

The Name Game: What’s in a Scientific Name?

Here’s where things get interesting (and a bit complicated). Delphinium formosum doesn’t appear to be widely recognized as a valid current species name in major botanical databases. This could mean a few things:

  • It might be an older name that’s been reclassified
  • It could be a regional common name that got mixed up with scientific naming
  • It may be a cultivar or variety name that’s been mistakenly used as a species name

The Delphinium Family Connection

While we can’t pin down specifics about Delphinium formosum, we do know it would belong to the beloved Delphinium genus – those tall, stately plants known for their spectacular spikes of blue, purple, pink, or white flowers. Delphiniums are members of the buttercup family and are famous for adding vertical drama to garden borders.

Geographic Distribution: A Mystery

Without clear taxonomic verification, we can’t definitively say where Delphinium formosum naturally occurs or if it’s native to any particular region. This uncertainty makes it impossible to recommend it as a native plant option for specific areas.

Should You Plant It?

Here’s our honest advice: if you’re looking for a specific Delphinium to add to your garden, we’d recommend sticking with well-documented species and cultivars. Some fantastic alternatives include:

  • Delphinium elatum (Alpine Delphinium)
  • Delphinium grandiflorum (Siberian Larkspur)
  • Native alternatives like Wild Lupine (Lupinus perennis) for similar vertical interest

Growing Delphiniums Successfully

If you do decide to grow any Delphinium species, here are some general care tips that apply to most members of this genus:

  • Choose a location with full sun to partial shade
  • Provide rich, well-draining soil with good organic matter
  • Ensure consistent moisture, especially during growing season
  • Stake tall varieties to prevent wind damage
  • Cut back after first bloom for potential second flowering

The Bottom Line

While Delphinium formosum remains something of a botanical mystery, there are plenty of well-documented, beautiful Delphinium species and cultivars available for your garden. If you’re committed to finding this particular plant, we’d recommend consulting with local botanical gardens or university extension services who might have more specific regional knowledge.

Remember, the best garden plants are ones you can research thoroughly and grow with confidence. When in doubt, choose plants with clear identities and proven track records in gardens like yours!

Delphinium Formosum

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Magnoliidae

Order

Ranunculales

Family

Ranunculaceae Juss. - Buttercup family

Genus

Delphinium L. - larkspur

Species

Delphinium formosum Boiss. & A. Huet. [excluded]

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA