North America Native Plant

Caribbean Princewood

Botanical name: Exostema caribaeum

USDA symbol: EXCA

Life cycle: perennial

Habit: shrub

Native status: Native to the lower 48 states âš˜ Native to Puerto Rico âš˜ Native to the U.S. Virgin Islands  

Synonyms: Cinchona caribaea Jacq. (CICA14)   

Caribbean Princewood: A Hidden Gem for Tropical Gardens If you’re looking for a charming native shrub that brings both beauty and ecological value to your tropical landscape, let me introduce you to Caribbean princewood (Exostema caribaeum). This delightful little shrub might not be the most famous plant in the gardening ...

Caribbean Princewood: A Hidden Gem for Tropical Gardens

If you’re looking for a charming native shrub that brings both beauty and ecological value to your tropical landscape, let me introduce you to Caribbean princewood (Exostema caribaeum). This delightful little shrub might not be the most famous plant in the gardening world, but it’s definitely one worth getting to know – especially if you’re gardening in the warm, sunny regions where it naturally thrives.

What Exactly is Caribbean Princewood?

Caribbean princewood is a perennial shrub that’s part of the coffee family, believe it or not! This multi-stemmed woody plant typically stays nice and manageable, usually growing to about 13-16 feet in height, though it often stays much smaller in garden settings. Think of it as the perfect Goldilocks plant – not too big, not too small, but just right for most landscape situations.

You might occasionally see this plant listed under its old scientific name, Cinchona caribaea, but don’t let that confuse you – it’s the same wonderful shrub.

Where Does Caribbean Princewood Call Home?

This native beauty hails from the warm, tropical regions of the Caribbean. In the United States, you’ll find it naturally growing in Florida (particularly the Keys), Puerto Rico, and the U.S. Virgin Islands. It’s perfectly adapted to the coastal, tropical lifestyle – which gives you a pretty good hint about what conditions it loves in your garden!

Why Your Garden (and Local Wildlife) Will Love It

Caribbean princewood isn’t just a pretty face – though it certainly is attractive with its glossy green leaves and clusters of small, tubular white flowers. Here’s why this shrub deserves a spot in your landscape:

  • The delicate white flowers are magnets for butterflies, moths, and other beneficial pollinators
  • Its compact, manageable size makes it perfect for smaller spaces or as part of a mixed shrub border
  • As a native plant, it supports local ecosystems and requires less water and maintenance once established
  • The attractive foliage provides year-round interest in your garden

Perfect Garden Settings

Caribbean princewood shines in several landscape situations:

  • Native plant gardens: Pairs beautifully with other Caribbean and Florida natives
  • Coastal landscapes: Tolerates salt spray and sandy soils like a champ
  • Tropical garden designs: Adds authentic Caribbean flair without being overwhelming
  • Pollinator gardens: Those white flowers are irresistible to beneficial insects
  • Low-maintenance landscapes: Perfect for gardeners who want beauty without the fuss

Growing Caribbean Princewood Successfully

Here’s the great news – Caribbean princewood is refreshingly easy to grow if you can provide its basic needs:

Climate Requirements

This is definitely a warm-weather plant, thriving in USDA hardiness zones 10-11. If you’re dealing with temperatures below about 40°F regularly, this might not be the shrub for you. But if you’re lucky enough to garden in tropical or subtropical conditions, you’re in for a treat!

Light and Soil Needs

Caribbean princewood is quite adaptable when it comes to light – it’s happy in full sun to partial shade, though it tends to flower more prolifically with plenty of sunshine. As for soil, well-draining is the key phrase here. Sandy soils? Perfect. Clay that holds water? Not so much. Think tropical beach rather than swampy marsh.

Watering and Maintenance

Once your Caribbean princewood gets settled in (give it regular water for the first growing season), it becomes quite drought tolerant. This makes sense when you consider its native habitat – these plants know how to make the most of whatever rainfall comes their way.

Maintenance is blissfully minimal. An occasional pruning to shape the plant or remove any dead wood is about all you’ll need to do. The shrub naturally maintains a nice, tidy form without much help from you.

Is Caribbean Princewood Right for Your Garden?

Caribbean princewood is an excellent choice if you:

  • Garden in zones 10-11
  • Want to support native wildlife and pollinators
  • Prefer low-maintenance plants
  • Love the idea of growing something authentically tropical
  • Need a medium-sized shrub that won’t outgrow its space

However, you might want to look elsewhere if you’re gardening in cooler climates or dealing with consistently wet, poorly-draining soils.

The Bottom Line

Caribbean princewood might not be the flashiest plant at the garden center, but it’s exactly the kind of reliable, beautiful, and ecologically valuable shrub that makes gardening such a joy. For tropical gardeners looking to create landscapes that are both gorgeous and environmentally responsible, this native gem deserves serious consideration. Plus, there’s something wonderfully satisfying about growing a plant that’s been thriving in the Caribbean long before any of us showed up with our gardening gloves and good intentions!

Caribbean Princewood

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Rubiales

Family

Rubiaceae Juss. - Madder family

Genus

Exostema (Pers.) Rich. ex Humb. & Bonpl. - exostema

Species

Exostema caribaeum (Jacq.) Schult. - Caribbean princewood

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