North America Native Plant

Threehearts

Botanical name: Tricardia watsonii

USDA symbol: TRWA2

Life cycle: perennial

Habit: forb

Native status: Native to the lower 48 states  

Threehearts: A Charming Native Wildflower for Desert Gardens If you’re looking to add a touch of delicate beauty to your drought-tolerant garden, meet threehearts (Tricardia watsonii) – a charming little native perennial that’s perfectly adapted to life in the American Southwest. This unassuming wildflower might not be the showiest plant ...

Threehearts: A Charming Native Wildflower for Desert Gardens

If you’re looking to add a touch of delicate beauty to your drought-tolerant garden, meet threehearts (Tricardia watsonii) – a charming little native perennial that’s perfectly adapted to life in the American Southwest. This unassuming wildflower might not be the showiest plant in the garden, but it brings a subtle elegance that’s hard to resist.

What Makes Threehearts Special

Threehearts gets its common name from its distinctive heart-shaped leaves that grow in clusters of three – hence the three hearts. This perennial forb produces small, delicate flowers in shades of white to soft pink that seem to dance above the foliage on slender stems. While it may not create the bold statement of a desert marigold or brittlebush, threehearts offers a gentle, woodland-like charm that softens harsh desert landscapes.

Where Threehearts Calls Home

As a true native of the American Southwest, threehearts naturally occurs across Arizona, California, Nevada, and Utah. This plant has spent thousands of years perfecting its survival skills in these challenging environments, making it an excellent choice for gardeners who want to work with nature rather than against it.

Growing Threehearts Successfully

The beauty of growing native plants like threehearts is that they’re already perfectly suited to your local conditions. Here’s what you need to know to help this little gem thrive:

  • Soil requirements: Well-drained, sandy or rocky soils are essential – threehearts absolutely cannot tolerate soggy conditions
  • Sun exposure: Full sun to partial shade work well
  • Water needs: Drought tolerant once established, requiring minimal supplemental watering
  • USDA zones: Hardy in zones 4-9
  • Size: Forms low-growing clumps, perfect for ground cover applications

Perfect Garden Companions

Threehearts shines brightest when planted alongside other native southwestern species. Consider pairing it with desert marigold, fairy duster, or penstemon for a beautiful native wildflower garden. It’s also excellent in rock gardens, where its delicate texture provides a lovely contrast to architectural succulents and cacti.

Benefits for Wildlife and Pollinators

Don’t let its small stature fool you – threehearts punches above its weight when it comes to supporting local ecosystems. The flowers attract small native bees and other beneficial insects, contributing to the pollinator network that keeps our native plant communities healthy and thriving.

Planting and Care Tips

Getting threehearts established is surprisingly straightforward:

  • Plant from seed in fall or early spring when natural rainfall can help with germination
  • Ensure excellent drainage – amend heavy clay soils with sand and gravel if necessary
  • Water lightly during establishment, then back off once plants are settled
  • Avoid fertilizers, which can actually harm this low-nutrient adapted plant
  • Allow plants to self-seed for natural-looking colonies

Is Threehearts Right for Your Garden?

Threehearts is ideal for gardeners who appreciate subtle beauty and want to support native ecosystems. It’s perfect if you’re creating a water-wise garden, establishing a native plant habitat, or simply looking for something different from the usual desert garden suspects.

However, this plant might not be the best choice if you’re seeking bold color or immediate impact. Threehearts rewards patient gardeners who enjoy discovering small treasures rather than those who prefer dramatic focal points.

By choosing threehearts, you’re not just adding a beautiful plant to your landscape – you’re preserving a piece of the Southwest’s natural heritage while creating habitat for the creatures that call this region home. And really, what could be more rewarding than that?

Threehearts

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

Tricardia Torr. ex S. Watson - tricardia

Species

Tricardia watsonii Torr. ex S. Watson - threehearts

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