North America Non-native Plant

Siam Benzoin

Botanical name: Styrax benzoides

USDA symbol: STBE3

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

Siam Benzoin: The Mysterious Styrax That’s Hard to Pin Down If you’ve stumbled across the name Siam benzoin (Styrax benzoides) in your plant research, you might be scratching your head wondering exactly what this mysterious member of the Styrax family is all about. Don’t worry – you’re not alone in ...

Siam Benzoin: The Mysterious Styrax That’s Hard to Pin Down

If you’ve stumbled across the name Siam benzoin (Styrax benzoides) in your plant research, you might be scratching your head wondering exactly what this mysterious member of the Styrax family is all about. Don’t worry – you’re not alone in your confusion!

What We Know (And Don’t Know) About Siam Benzoin

Siam benzoin belongs to the Styrax genus, a group of plants known for producing aromatic resins. The common name Siam benzoin gives us a clue about its likely geographic origins, as Siam is the former name for Thailand. This suggests the plant has roots in Southeast Asian regions.

However, here’s where things get a bit murky: reliable, detailed information specifically about Styrax benzoides as a distinct species is surprisingly scarce in commonly available gardening and botanical resources. This could mean a few things – it might be a rarely cultivated species, it could have taxonomic complications, or it might be known by other names in different regions.

The Styrax Family Connection

What we do know is that Siam benzoin is part of the broader Styrax family, which includes several ornamental species prized for their:

  • Fragrant, often white or cream-colored flowers
  • Attractive branching patterns
  • Interesting bark characteristics
  • Potential for aromatic resin production

Should You Plant Siam Benzoin?

Here’s the honest truth: without clear information about this specific species’ growth habits, hardiness zones, invasive potential, or cultivation requirements, it’s difficult to make a solid recommendation either way.

If you’re considering Siam benzoin for your garden, we’d suggest:

  • Verifying the exact species identification with local botanical experts
  • Checking with your local extension office about its appropriateness for your region
  • Researching whether it’s actually available from reputable nurseries
  • Looking into well-documented native alternatives from the Styrax genus

Native Alternatives to Consider

While you’re doing your detective work on Siam benzoin, consider these well-documented native Styrax species that might scratch the same gardening itch:

  • American snowbell (Styrax americanus) – native to southeastern United States
  • Bigleaf snowbell (Styrax grandifolius) – also native to southeastern regions

These alternatives offer the beautiful characteristics typical of the Styrax genus while providing clear growing information and known ecological benefits.

The Bottom Line

Siam benzoin remains something of a botanical puzzle in the gardening world. While the name suggests an intriguing plant with Southeast Asian heritage, the lack of readily available cultivation information makes it a challenging choice for most home gardeners.

If you’re drawn to the idea of growing a Styrax species, you’ll likely have much better success with well-documented native alternatives that come with clear growing guides, known hardiness zones, and established sources for purchasing healthy plants.

Sometimes the most interesting plants are the ones that keep a little mystery about them – but for your garden’s sake, it might be better to save the mystery novels for bedtime reading!

Siam Benzoin

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Ebenales

Family

Styracaceae DC. & Spreng. - Storax family

Genus

Styrax L. - snowbell

Species

Styrax benzoides Craib - Siam benzoin

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