North America Native Plant

Caterpillars

Botanical name: Phacelia congesta

USDA symbol: PHCO2

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Phacelia congesta Hook. var. dissecta A. Gray (PHCOD)   

Caterpillars: The Quirky Native Wildflower That’s Not What You Think Don’t let the name fool you – caterpillars (Phacelia congesta) won’t turn into butterflies, but they’ll certainly attract plenty of them to your garden! This charming native wildflower gets its unusual common name from its fuzzy, hairy appearance that might ...

Caterpillars: The Quirky Native Wildflower That’s Not What You Think

Don’t let the name fool you – caterpillars (Phacelia congesta) won’t turn into butterflies, but they’ll certainly attract plenty of them to your garden! This charming native wildflower gets its unusual common name from its fuzzy, hairy appearance that might remind you of tiny caterpillars crawling through your landscape.

A True Native Beauty

Caterpillars is a proud native of the American Southwest, naturally occurring across New Mexico, Oklahoma, and Texas. As a member of the waterleaf family, this annual or biennial forb has been quietly beautifying the region’s landscapes long before European settlement. When you plant caterpillars in your garden, you’re not just adding color – you’re preserving a piece of regional natural heritage.

What Makes Caterpillars Special

This delightful wildflower produces clusters of small, funnel-shaped flowers that range from soft blue to vibrant purple. The blooms are packed together in dense, congested heads (hence the species name congesta), creating eye-catching displays that seem to glow in the landscape. The entire plant has a fuzzy, silvery-green appearance thanks to fine hairs covering the leaves and stems.

As a forb, caterpillars grows as a herbaceous plant without woody stems, typically reaching modest heights that make it perfect for front borders or naturalizing in larger areas.

Perfect for Southwestern Gardens

Caterpillars thrives in USDA hardiness zones 7-10, making it an excellent choice for gardeners in warmer climates. This tough little plant is ideal for:

  • Xerophytic and drought-tolerant gardens
  • Native plant landscapes
  • Wildflower meadows and natural areas
  • Pollinator gardens
  • Low-maintenance landscapes

A Pollinator Magnet

One of caterpillars’ greatest strengths is its ability to attract beneficial insects. The nectar-rich flowers are particularly beloved by native bees, butterflies, and other pollinators. By including this plant in your landscape, you’re creating valuable habitat and food sources for these essential creatures.

Growing Caterpillars Successfully

The beauty of caterpillars lies in its simplicity – this is truly a plant that thrives on neglect! Here’s how to grow it successfully:

Planting

  • Direct seed in fall or early spring for best results
  • Choose a location with full sun exposure
  • Ensure well-drained soil – caterpillars doesn’t tolerate soggy conditions
  • No special soil preparation needed

Care and Maintenance

  • Water sparingly – this plant is drought tolerant once established
  • Avoid fertilizing, as rich soils can actually reduce flowering
  • Allow plants to self-seed for natural colonies
  • Deadhead spent flowers if you want to prevent self-seeding

Why Choose Caterpillars for Your Garden

Caterpillars offers gardeners a unique combination of benefits that’s hard to find in other plants. It’s incredibly low-maintenance, supports local wildlife, and provides charming color with minimal input. As an annual or biennial, it offers flexibility in garden design – you can let it naturalize in wild areas or enjoy it as a seasonal accent.

For gardeners looking to reduce water usage while supporting native ecosystems, caterpillars represents an ideal choice. Its ability to thrive in challenging conditions makes it perfect for those transitioning from high-maintenance landscapes to more sustainable, regionally appropriate plantings.

Whether you’re creating a dedicated native plant garden or simply want to add some southwestern charm to your landscape, caterpillars proves that sometimes the most unassuming plants can make the biggest impact. Give this fuzzy little native a try – your local pollinators will thank you!

Caterpillars

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

Solanales

Family

Hydrophyllaceae R. Br. - Waterleaf family

Genus

Phacelia Juss. - phacelia

Species

Phacelia congesta Hook. - caterpillars

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