North America Native Plant

Thicketwort

Botanical name: Oplonia microphylla

USDA symbol: OPMI

Life cycle: perennial

Habit: shrub

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

Thicketwort: A Native Caribbean Shrub Worth Knowing If you’re gardening in the Caribbean or other tropical regions, you might want to get acquainted with thicketwort (Oplonia microphylla). This unassuming native shrub may not have the flashiest name, but it’s got some serious credentials as a true local plant that belongs ...

Thicketwort: A Native Caribbean Shrub Worth Knowing

If you’re gardening in the Caribbean or other tropical regions, you might want to get acquainted with thicketwort (Oplonia microphylla). This unassuming native shrub may not have the flashiest name, but it’s got some serious credentials as a true local plant that belongs in your landscape.

What Exactly Is Thicketwort?

Thicketwort is a perennial shrub that’s perfectly sized for most garden spaces. True to its scientific name microphylla (meaning small leaves), this multi-stemmed woody plant typically stays under 13-16 feet tall, making it a manageable choice for residential landscapes. Its delicate branching structure and tiny leaves give it a fine-textured appearance that can add subtle interest to your garden composition.

Where Does Thicketwort Call Home?

This little shrub is a true Caribbean native, naturally occurring in Puerto Rico and the U.S. Virgin Islands. When you plant thicketwort, you’re not just adding another plant to your garden – you’re supporting the local ecosystem and preserving a piece of Caribbean botanical heritage.

Why Consider Thicketwort for Your Garden?

Here’s where thicketwort really shines:

  • True native status: As a genuine local plant, it’s perfectly adapted to Caribbean growing conditions
  • Manageable size: Won’t overwhelm smaller gardens or require constant pruning
  • Low maintenance potential: Native plants typically require less fussing once established
  • Ecosystem support: Provides habitat and resources for local wildlife

Where Does Thicketwort Fit in Your Landscape?

Think of thicketwort as nature’s supporting actor. This shrub works beautifully as:

  • An understory plant beneath taller native trees
  • Part of a mixed native shrub border
  • A naturalistic planting in less formal garden areas
  • Foundation plantings where you want something authentically local

Growing Conditions and Care

As a Caribbean native, thicketwort is likely happiest in tropical to subtropical conditions, probably thriving in USDA hardiness zones 10-11. While specific growing requirements aren’t well-documented in cultivation guides, you can make some educated guesses based on its native habitat:

  • Climate: Warm, tropical conditions year-round
  • Soil: Well-draining soils typical of Caribbean environments
  • Water: Likely drought-tolerant once established, matching local rainfall patterns
  • Light: Probably adaptable to partial shade through full sun

The Reality Check

Here’s the honest truth about thicketwort: it’s not going to be the star of your garden show. This is a plant you choose for its ecological value and authentic native status rather than showstopping blooms or dramatic foliage. If you’re gardening outside the Caribbean region, thicketwort probably isn’t the right choice for your climate anyway.

Getting Started with Thicketwort

Finding thicketwort might take some detective work, as it’s not commonly available in mainstream nurseries. Your best bets are:

  • Native plant societies in Puerto Rico or the Virgin Islands
  • Specialty nurseries focusing on Caribbean native plants
  • Botanical gardens with native plant programs

Since cultivation information is limited, consider thicketwort an adventure in native gardening – perfect for the gardener who enjoys working with authentic local plants and doesn’t mind a little trial and learning along the way.

The Bottom Line

Thicketwort won’t make headlines in garden magazines, but for Caribbean gardeners committed to native plants, it represents something valuable: a genuine piece of local flora that connects your garden to the natural landscape around you. If you’re in the right climate zone and can source it responsibly, thicketwort deserves a spot in your native plant collection.

Thicketwort

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

Scrophulariales

Family

Acanthaceae Juss. - Acanthus family

Genus

Oplonia Raf. - oplonia

Species

Oplonia microphylla (Lam.) Stearn - thicketwort

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