North America Non-native Plant

Cassia

Botanical name: Cassia

USDA symbol: CASSI

Life cycle: perennial

Habit: tree

Native status: It's either native or not native in the lower 48 states âš˜ Non-native, reproduces and persists in the wild in Pacific Basin excluding Hawaii âš˜ It's either native or not native in Puerto Rico âš˜ It's either native or not native in the U.S. Virgin Islands  

Cassia: A Tropical Tree Genus Worth Knowing About If you’ve come across the name Cassia in your gardening research, you might be wondering what exactly this plant is and whether it belongs in your landscape. The truth is, Cassia represents an entire genus of trees rather than a single species, ...

Cassia: A Tropical Tree Genus Worth Knowing About

If you’ve come across the name Cassia in your gardening research, you might be wondering what exactly this plant is and whether it belongs in your landscape. The truth is, Cassia represents an entire genus of trees rather than a single species, which makes giving specific growing advice a bit like trying to describe all dogs in one breath – there’s quite a bit of variation to consider!

What Exactly is Cassia?

Cassia is a genus of perennial, woody trees that typically grow as single-trunked specimens reaching heights greater than 13-16 feet. These trees are part of the legume family and are known for their often showy flowers and distinctive seed pods. However, without knowing the specific species, it’s challenging to provide detailed characteristics, as different Cassia species can look quite different from one another.

Native Status and Geographic Distribution

Here’s where things get interesting – and a bit complicated. Cassia species are generally not native to the lower 48 United States, though they have been introduced and now grow wild in some areas of the Pacific Basin. You can find various Cassia species growing in Florida, Palau, Puerto Rico, and the Virgin Islands, where they’ve established themselves as part of the naturalized flora.

The Challenge of Growing Cassia

Here’s the thing about wanting to grow Cassia – it’s a bit like saying you want to grow a tree without specifying which kind! The Cassia genus includes dozens of species, each with their own specific needs, characteristics, and growing requirements. Some are drought-tolerant, others prefer consistent moisture. Some are cold-hardy, others are strictly tropical.

Why You Might Want to Reconsider

Since many Cassia species are non-native, you might want to explore native alternatives that provide similar benefits to your local ecosystem. Native trees offer several advantages:

  • Support local wildlife and pollinators
  • Require less water and maintenance once established
  • Are naturally adapted to your local climate
  • Help preserve regional biodiversity

If You’re Set on Cassia

If you’re determined to grow a Cassia species, here’s what you absolutely need to do first:

  • Identify the specific species you’re interested in
  • Research that particular species’ growing requirements
  • Verify it’s not invasive in your area
  • Check local regulations about planting non-native species

Without knowing the specific species, it’s impossible to provide accurate information about hardiness zones, care requirements, or potential problems.

Better Alternatives

Instead of taking a shot in the dark with an unspecified Cassia, consider researching native trees in your area that offer similar characteristics. Many regions have beautiful native flowering trees that provide the aesthetic appeal you’re looking for while supporting local ecosystems.

The Bottom Line

While Cassia trees can certainly be beautiful additions to appropriate landscapes, the lack of species-specific information makes it difficult to recommend them broadly. Your best bet is to work with local native plant societies, extension offices, or knowledgeable nurseries to identify native alternatives that will thrive in your specific location and provide the look you’re after.

Remember, successful gardening is about choosing the right plant for the right place – and that starts with knowing exactly what plant you’re working with!

Cassia

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Rosidae

Order

Fabales

Family

Fabaceae Lindl. - Pea family

Genus

Cassia L. - cassia

Species

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