North America Native Plant

Tropical Puff

Botanical name: Neptunia pubescens var. microcarpa

USDA symbol: NEPUM

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Neptunia microcarpa Rose (NEMI)  âš˜  Neptunia palmeri Britton & Rose (NEPA5)   

Tropical Puff: A Texas Native Worth Discovering Meet tropical puff (Neptunia pubescens var. microcarpa), a charming native perennial that’s quietly making its mark in Texas landscapes. While this plant might not be on every gardener’s radar yet, this lesser-known variety of the Neptunia family offers unique qualities for those seeking ...

Tropical Puff: A Texas Native Worth Discovering

Meet tropical puff (Neptunia pubescens var. microcarpa), a charming native perennial that’s quietly making its mark in Texas landscapes. While this plant might not be on every gardener’s radar yet, this lesser-known variety of the Neptunia family offers unique qualities for those seeking authentic native plants.

What Exactly Is Tropical Puff?

Tropical puff is a perennial forb—basically a non-woody flowering plant that comes back year after year. Unlike shrubs or trees, this herbaceous beauty puts all its energy into flowers and foliage rather than building thick, woody stems. You might also see it listed under its former scientific names, Neptunia microcarpa or Neptunia palmeri, which can be helpful when hunting for seeds or plants from specialty native plant suppliers.

Where Does It Call Home?

This variety of tropical puff is native to Texas, making it a true Lone Star State original. As a plant that’s evolved specifically in Texas conditions, it’s naturally adapted to the local climate, soil, and wildlife—which means less work for you once it’s established.

The Good, The Bad, and The Reality

Here’s the honest truth about tropical puff: it’s somewhat of a botanical mystery. While we know it’s a native Texas perennial, detailed growing information for this specific variety is surprisingly scarce. This could be either exciting (you’re pioneering with a rare native!) or frustrating (you’re flying a bit blind).

Reasons you might want to try it:

  • It’s authentically native to Texas
  • As a perennial, it should return each year once established
  • Native plants typically require less water and care once mature
  • You’ll be supporting local ecosystems
  • It has facultative wetland status, meaning it’s adaptable to both wet and dry conditions

Potential challenges:

  • Limited availability from nurseries
  • Scarce specific growing information
  • You might need to experiment to find its preferred conditions

Growing Tropical Puff: An Adventure in Native Gardening

Since specific growing information for this variety is limited, you’ll want to approach tropical puff cultivation as a bit of an experiment. Here’s what we can reasonably assume based on its native status and botanical family:

Best guesses for growing conditions:

  • Full sun to partial shade (most Texas natives prefer plenty of sun)
  • Well-draining soil (few plants like soggy feet in Texas heat)
  • Drought tolerance once established (it’s a Texas native, after all)
  • Adaptable to various moisture levels due to its facultative wetland status

Where to Use It in Your Garden

Given its herbaceous nature and native status, tropical puff would likely work well in:

  • Native plant gardens
  • Naturalized areas
  • Wildlife gardens
  • Areas with variable moisture levels
  • Mixed perennial borders featuring Texas natives

The Bottom Line

Tropical puff represents both an opportunity and a challenge for adventurous native plant gardeners. If you can track down plants or seeds (which might require some detective work with native plant societies or specialty suppliers), you’ll be growing a true Texas original. Just be prepared for some trial and error as you learn what makes this particular variety happy.

For gardeners who prefer plants with well-documented care instructions, you might want to start with better-known native alternatives and save tropical puff for when you’re feeling more experimental. But for those who love the idea of growing something truly unique and supporting Texas biodiversity, this little-known native could be exactly the adventure your garden needs.

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Great Plains

FAC

Facultative - Plants with this status can occur in wetlands and non-wetlands

Tropical Puff

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

Neptunia Lour. - puff

Species

Neptunia pubescens Benth. - tropical puff

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