North America Native Plant

Onesided Monkeyflower

Botanical name: Mimulus subsecundus

USDA symbol: MISU

Life cycle: annual

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Eunanus subsecundus (A. Gray) Greene (EUSU5)   

Onesided Monkeyflower: A Charming California Native Worth Protecting Meet the onesided monkeyflower (Mimulus subsecundus), a delightful little California native that’s as unique as its name suggests. This annual wildflower might be small in stature, but it packs a punch when it comes to charm and ecological value. If you’re looking ...

Rare plant alert!

Region: Conservation status by state

Status: S3: Status is uncertain but is somewhere between the following rankings: Vulnerable: Either very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or factors are making it vulnerable to extinction. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals ⚘

Onesided Monkeyflower: A Charming California Native Worth Protecting

Meet the onesided monkeyflower (Mimulus subsecundus), a delightful little California native that’s as unique as its name suggests. This annual wildflower might be small in stature, but it packs a punch when it comes to charm and ecological value. If you’re looking to add authentic California character to your native garden while supporting local wildlife, this special plant deserves your attention.

What Makes It Special

The onesided monkeyflower gets its common name from its distinctive flowering pattern – the small, snapdragon-like blooms arrange themselves along one side of the stem, creating an eye-catching one-sided display. These cheerful yellow flowers appear in spring and early summer, bringing bright color to the landscape when many other native annuals are just getting started.

As an annual forb, this plant completes its entire life cycle in one growing season, making it a perfect choice for gardeners who enjoy the ever-changing nature of wildflower displays.

Where It Calls Home

This monkeyflower is a true California endemic, meaning you won’t find it growing naturally anywhere else in the world. It’s primarily found throughout California, particularly in the Sierra Nevada foothills and Central Valley regions.

A Plant That Needs Our Help

Here’s something important to know: the onesided monkeyflower is considered vulnerable, with a conservation status of S3. This means it’s at risk in the wild due to habitat loss and other pressures. By choosing to grow this plant in your garden, you’re not just adding beauty – you’re helping preserve a piece of California’s natural heritage.

Important note: If you decide to grow this special plant, please source seeds or plants only from reputable native plant nurseries that collect responsibly. Never collect from wild populations, as this can harm the already vulnerable native stands.

Why Grow Onesided Monkeyflower?

There are several compelling reasons to include this native gem in your garden:

  • Low maintenance: As a California native, it’s naturally adapted to local conditions and requires minimal care once established
  • Water-wise: Perfect for drought-tolerant landscaping and xeriscapes
  • Pollinator magnet: The flowers attract native bees and other small pollinators, supporting local ecosystems
  • Authentic character: Adds genuine California native plant diversity to your landscape
  • Conservation impact: Growing it helps preserve genetic diversity and supports conservation efforts

Growing Conditions and Care

The onesided monkeyflower thrives in conditions similar to its natural habitat:

  • Sunlight: Full sun exposure
  • Soil: Well-draining sandy or rocky soils work best
  • Water: Low water needs once established; drought tolerant
  • Climate: Best suited for USDA zones 8-10, particularly California’s Mediterranean climate

Planting and Care Tips

Growing onesided monkeyflower successfully is surprisingly straightforward:

  • When to plant: Direct seed in fall for spring germination, mimicking natural patterns
  • Soil preparation: Ensure good drainage; amend heavy clay soils with sand or gravel
  • Watering: Provide moderate water during germination and early growth, then reduce as plants establish
  • Maintenance: Very low maintenance once established; allow plants to self-seed for natural colonies

Perfect Garden Settings

This versatile native works beautifully in several garden styles:

  • Native plant gardens and California botanical collections
  • Wildflower meadows and naturalistic landscapes
  • Rock gardens and xeriscapes
  • Pollinator gardens focused on native species
  • Seasonal color displays in Mediterranean-style gardens

Supporting California’s Natural Heritage

By choosing to grow the onesided monkeyflower, you’re making a meaningful contribution to conservation efforts. This vulnerable species benefits from having more populations in cultivation, which helps preserve its genetic diversity and provides backup populations should wild stands face further challenges.

Remember, every native plant you grow creates habitat for native wildlife, from the smallest pollinators to the birds that feed on seeds and insects. It’s a simple way to make your garden part of the larger ecosystem rather than separate from it.

The onesided monkeyflower may be small and humble, but it represents something much larger – our connection to the unique natural heritage of California. Give this special native a place in your garden, and you’ll be rewarded with its cheerful blooms and the satisfaction of helping preserve a vulnerable piece of our natural world.

Onesided Monkeyflower

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

Scrophulariaceae Juss. - Figwort family

Genus

Mimulus L. - monkeyflower

Species

Mimulus subsecundus A. Gray - onesided monkeyflower

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