North America Native Plant

Scarlet Gilia

Botanical name: Ipomopsis aggregata collina

USDA symbol: IPAGC2

Life cycle: biennial

Habit: forb

Native status: Native to the lower 48 states  

Synonyms: Gilia candida Rydb. ssp. collina (Greene) Wherry (GICAC4)   

Scarlet Gilia: A Hidden Gem of the Southwest If you’re looking to add some authentic southwestern flair to your garden, you might want to get acquainted with Ipomopsis aggregata collina, better known as scarlet gilia. This lesser-known variety of the beloved scarlet gilia offers native gardeners a chance to cultivate ...

Scarlet Gilia: A Hidden Gem of the Southwest

If you’re looking to add some authentic southwestern flair to your garden, you might want to get acquainted with Ipomopsis aggregata collina, better known as scarlet gilia. This lesser-known variety of the beloved scarlet gilia offers native gardeners a chance to cultivate something truly special – though finding detailed information about this particular form can be a bit like searching for a needle in a haystack!

What Makes Scarlet Gilia Special?

Scarlet gilia belongs to the forb family, which is gardener-speak for herbaceous flowering plant – basically, it’s not woody like a shrub, but it’s definitely more substantial than your average annual flower. This particular variety can live as either a biennial (completing its life cycle over two years) or as a perennial, giving it some flexibility in how it approaches life in your garden.

As a true native of the American Southwest, this plant has earned its stripes growing in some pretty challenging conditions. It’s perfectly at home in the lower 48 states, with this specific variety calling Colorado and New Mexico home.

Why Consider Planting Scarlet Gilia?

Here’s where things get a bit tricky – and honestly, pretty exciting for the adventurous gardener. While the broader scarlet gilia family is well-documented as a pollinator magnet and stunning garden addition, specific information about the collina variety is surprisingly scarce. What we do know is that it shares the family reputation for being:

  • A native plant that supports local ecosystems
  • Well-adapted to southwestern growing conditions
  • Part of a plant family known for attractive flowers
  • Likely beneficial to local pollinators, based on its relatives’ reputation

The Growing Challenge

Let’s be honest – growing Ipomopsis aggregata collina is a bit of an adventure into the unknown. Since detailed growing information for this specific variety is limited, you’ll be working with some educated guesses based on its close relatives and its native range.

Based on its Colorado and New Mexico origins, this plant likely prefers:

  • Well-draining soil (southwestern natives typically hate wet feet)
  • Full sun to partial shade
  • Lower to moderate water requirements once established
  • USDA hardiness zones that match its native range (likely zones 4-8, though this is an educated guess)

The Bottom Line

Should you plant scarlet gilia? If you’re in Colorado or New Mexico and love the idea of growing something truly native to your area, this could be a fantastic choice. The challenge lies in finding reliable seeds or plants, since this specific variety isn’t commonly available in the nursery trade.

For gardeners outside its native range, you might want to consider other well-documented native alternatives that can give you similar benefits with more predictable results. Your local native plant society can help you identify the best scarlet gilia relatives for your specific region.

A Plant for the Adventurous

Ipomopsis aggregata collina represents one of those wonderful gardening mysteries – a native plant that’s clearly adapted to its environment but hasn’t yet been fully explored by the gardening world. If you’re the type of gardener who loves a challenge and wants to help document how lesser-known natives perform in cultivation, this could be your perfect project plant.

Just remember to source any seeds or plants responsibly from reputable native plant suppliers, and consider keeping notes on its performance to contribute to our collective knowledge about this intriguing southwestern native.

Scarlet Gilia

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

Polemoniaceae Juss. - Phlox family

Genus

Ipomopsis Michx. - ipomopsis

Species

Ipomopsis aggregata (Pursh) V.E. Grant - scarlet gilia

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