North America Native Plant

Santa Susana Bush Monkeyflower

Botanical name: Diplacus rutilus

USDA symbol: DIRU3

Life cycle: perennial

Habit: subshrub

Native status: Native to the lower 48 states  

Synonyms: Diplacus longiflorus Nutt. var. rutilus (A.L. Grant) McMinn (DILOR)  âš˜  Mimulus longiflorus (Nutt.) A.L. Grant var. rutilus A.L. Grant (MILOR)   

Santa Susana Bush Monkeyflower: A California Native Gem for Your Garden Meet the Santa Susana bush monkeyflower (Diplacus rutilus), a delightful California native that’s sure to add a splash of vibrant color to your landscape. This charming perennial shrub might not be the most famous plant in the Golden State, ...

Rare plant alert!

Region: Conservation status by state

Status: S3?Q: Status is uncertain but is somewhere between the following rankings: Inexact rank: ⚘ Uncertain taxonomy: ⚘ 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 ⚘

Santa Susana Bush Monkeyflower: A California Native Gem for Your Garden

Meet the Santa Susana bush monkeyflower (Diplacus rutilus), a delightful California native that’s sure to add a splash of vibrant color to your landscape. This charming perennial shrub might not be the most famous plant in the Golden State, but it certainly deserves a spot in gardens that celebrate local flora.

What Makes This Plant Special?

The Santa Susana bush monkeyflower is a true California original, endemic to the Santa Susana Mountains and surrounding areas. This lovely shrub produces stunning tubular flowers in shades of orange to red that practically glow in the landscape. As a member of the monkeyflower family, it brings both beauty and ecological value to your garden space.

You might also see this plant listed under its former scientific names, including Diplacus longiflorus var. rutilus or Mimulus longiflorus var. rutilus, but Diplacus rutilus is the current accepted name.

Where Does It Grow Naturally?

This native beauty calls California home, specifically thriving in the unique conditions found in and around the Santa Susana Mountains. As a California endemic, it’s perfectly adapted to the state’s Mediterranean climate and represents the kind of specialized local flora that makes each region unique.

Why Consider Growing Santa Susana Bush Monkeyflower?

There are several compelling reasons to welcome this native into your garden:

  • Stunning blooms: The vibrant orange to red tubular flowers create eye-catching displays
  • Hummingbird magnet: Those tubular flowers are perfectly designed to attract hummingbirds
  • Pollinator-friendly: Native bees and other pollinators also appreciate this plant
  • Drought tolerance: Once established, it requires minimal water
  • Native plant gardens: Perfect for authentic California native landscapes
  • Low maintenance: Thrives with minimal intervention once settled in

Important Note About Sourcing

Before you rush out to find this plant, here’s something important to know: the Santa Susana bush monkeyflower has an uncertain conservation status. While not definitively rare, its limited natural range means you should only purchase plants from reputable native plant nurseries that use responsibly sourced material. Never collect plants from the wild, and always choose nursery-grown specimens.

Growing Conditions and Care

This shrub is wonderfully adapted to California’s conditions, making it relatively easy to grow if you can provide what it needs:

  • Sunlight: Full sun is best for optimal flowering
  • Soil: Well-draining soil is essential – it won’t tolerate soggy conditions
  • Water: Drought-tolerant once established, but appreciates occasional deep watering
  • Climate: Thrives in USDA hardiness zones 9-10
  • Size: Typically grows as a multi-stemmed shrub, usually staying under 13-16 feet

Perfect Garden Settings

The Santa Susana bush monkeyflower shines in several landscape styles:

  • Native plant gardens celebrating California flora
  • Xeriscape or drought-tolerant landscapes
  • Mediterranean-style gardens
  • Slope plantings for erosion control
  • Pollinator gardens focused on attracting hummingbirds and native bees

Planting and Care Tips

Getting your Santa Susana bush monkeyflower off to a good start is fairly straightforward:

  • Best planting time: Fall planting allows roots to establish before summer heat
  • Soil preparation: Ensure excellent drainage – amend heavy clay soils if needed
  • Initial care: Water regularly the first year while roots establish
  • Mature care: Once established, water deeply but infrequently
  • Pruning: Light pruning after flowering can help maintain shape
  • Fertilizing: Generally unnecessary in appropriate soil conditions

The Bottom Line

The Santa Susana bush monkeyflower offers California gardeners a chance to grow something truly special – a plant that represents the unique beauty of local ecosystems. While you’ll want to source it responsibly given its limited natural range, this drought-tolerant native rewards thoughtful gardeners with gorgeous blooms and the satisfaction of supporting local wildlife. If you’re building a native plant garden or looking for water-wise landscaping options, this charming monkeyflower deserves serious consideration.

Just remember: always buy from reputable native plant nurseries, never wild-collect, and enjoy watching the hummingbirds discover your garden’s newest treasure.

Santa Susana Bush 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

Diplacus Nutt. - bush monkeyflower

Species

Diplacus rutilus (A.L. Grant) McMinn - Santa Susana bush monkeyflower

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