North America Native Plant

Tinypetal Waxweed

Botanical name: Cuphea micrantha

USDA symbol: CUMI

Life cycle: annual

Habit: forb

Native status: Native to Puerto Rico  

Synonyms: Parsonsia micrantha (Kunth) Jennings (PAMI12)   

Tinypetal Waxweed: A Charming Native Annual for Wetland Gardens If you’re looking for a delicate, water-loving native plant to add charm to your wetland garden, tinypetal waxweed (Cuphea micrantha) might just be the perfect choice. This petite annual brings a splash of color to soggy spots where many other plants ...

Tinypetal Waxweed: A Charming Native Annual for Wetland Gardens

If you’re looking for a delicate, water-loving native plant to add charm to your wetland garden, tinypetal waxweed (Cuphea micrantha) might just be the perfect choice. This petite annual brings a splash of color to soggy spots where many other plants fear to tread.

What Is Tinypetal Waxweed?

Tinypetal waxweed is a native annual forb that belongs to the diverse Cuphea genus. As a forb, it’s a non-woody flowering plant that completes its entire life cycle in one growing season. Don’t let its delicate appearance fool you – this little plant is perfectly adapted to thrive in consistently wet conditions that would drown most garden favorites.

You might occasionally see this plant listed under its botanical synonym Parsonsia micrantha, but Cuphea micrantha is the accepted scientific name.

Where Does It Come From?

This charming native calls Puerto Rico home, where it has evolved to flourish in the island’s wetland environments. Its natural range is limited to Puerto Rico, making it a true Caribbean treasure.

Why Grow Tinypetal Waxweed?

There are several compelling reasons to consider adding this native beauty to your landscape:

  • Wetland specialist: Classified as an obligate wetland plant, it’s perfectly suited for those challenging soggy spots in your yard
  • Native authenticity: Supporting local ecosystems by choosing native plants
  • Delicate beauty: Small, tubular purple to pink flowers add subtle elegance
  • Pollinator friendly: The tiny flowers attract small pollinators like native bees and butterflies
  • Low maintenance: Once established in proper conditions, it requires minimal care

What Does It Look Like?

Tinypetal waxweed lives up to its name with truly tiny, delicate flowers that appear in shades of purple to pink. As an annual forb, it maintains a herbaceous growth habit without developing woody stems. The plant stays relatively compact, making it perfect for tucking into smaller wetland spaces or using as a ground cover in boggy areas.

Ideal Growing Conditions

This plant is quite particular about its growing conditions, but once you understand its needs, it’s relatively easy to please:

  • Moisture: Requires consistently wet to saturated soil – think bog garden conditions
  • Light: Performs best in full sun to partial shade
  • Climate: Thrives in USDA hardiness zones 10-11, preferring tropical to subtropical conditions
  • Soil: Tolerates various soil types as long as they remain consistently moist

Perfect Garden Settings

Tinypetal waxweed shines in specific landscape situations:

  • Rain gardens and bioswales
  • Edges of ponds or water features
  • Bog gardens
  • Naturally wet areas of the landscape
  • Container water gardens (in consistently moist potting mix)

Planting and Care Tips

Growing tinypetal waxweed successfully is all about recreating its natural wetland habitat:

  • Location selection: Choose the wettest spot in your garden or create one with regular irrigation
  • Soil preparation: Ensure drainage is poor to nonexistent – this plant loves wet feet
  • Watering: Maintain consistently saturated conditions throughout the growing season
  • Annual replanting: Since it’s an annual, you’ll need to replant each year or allow it to self-seed
  • Minimal fertilization: Native plants typically don’t need heavy feeding

Things to Consider

Before adding tinypetal waxweed to your garden, keep these factors in mind:

  • Climate limitations: Only suitable for very warm climates (zones 10-11)
  • Annual nature: Requires replanting each year
  • Specific water needs: Won’t tolerate dry conditions
  • Limited availability: May be challenging to find in typical nurseries

The Bottom Line

Tinypetal waxweed is a specialized native plant that excels in one particular niche – consistently wet conditions in warm climates. If you have a wetland garden, bog area, or persistently soggy spot that needs beautifying, this delicate annual could be exactly what you’re looking for. Its tiny flowers and native status make it an excellent choice for gardeners committed to supporting local ecosystems while adding unique beauty to challenging growing conditions.

Just remember: this isn’t a plant for everyone or every garden. But for those with the right conditions and climate, tinypetal waxweed offers a charming way to embrace native gardening in wet spaces.

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

Caribbean

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Tinypetal Waxweed

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

Myrtales

Family

Lythraceae J. St.-Hil. - Loosestrife family

Genus

Cuphea P. Br. - waxweed

Species

Cuphea micrantha Kunth - tinypetal waxweed

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