North America Native Plant

Ram’s Horn

Botanical name: Proboscidea louisianica louisianica

USDA symbol: PRLOL

Life cycle: annual

Habit: forb

Native status: Non-native, reproduces and persists in the wild in Canada âš˜ Native to the lower 48 states  

Synonyms: Martynia louisianica Mill. (MALO4)  âš˜  Martynia louisiana Mill., orth. var. (MALO6)  âš˜  Martynia proboscidea Gloxin (MAPR7)  âš˜  Proboscidea jussieui auct. (PRJU2)   

Ram’s Horn: The Quirky Annual That’s All About Those Crazy Seed Pods If you’re looking for a conversation starter in your garden, let me introduce you to ram’s horn (Proboscidea louisianica louisianica). This fascinating annual plant might not win any beauty contests with its flowers, but wait until you see ...

Ram’s Horn: The Quirky Annual That’s All About Those Crazy Seed Pods

If you’re looking for a conversation starter in your garden, let me introduce you to ram’s horn (Proboscidea louisianica louisianica). This fascinating annual plant might not win any beauty contests with its flowers, but wait until you see what happens afterward – those seed pods are absolutely wild!

What Exactly Is Ram’s Horn?

Ram’s horn is an annual forb, which is just a fancy way of saying it’s a non-woody herbaceous plant that completes its entire life cycle in one growing season. Don’t let the scientific name intimidate you – this plant is all about those distinctive curved seed pods that look remarkably like, well, a ram’s horns! The plant also goes by several historical names including Martynia louisianica, but ram’s horn is much easier to remember.

Where Does It Come From?

This unique plant is native to the lower 48 United States, with its original range centered in the southwestern regions, particularly Texas and Louisiana. However, it’s quite the traveler and now grows across a surprisingly wide area including Alabama, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, Washington, West Virginia, and Wyoming. It’s even made its way into parts of Canada including Ontario and Saskatchewan.

Why Grow Ram’s Horn?

Let’s be honest – you’re probably not growing this plant for its flowers. While the trumpet-shaped blooms do attract bees and other pollinators, the real star of the show comes later. Here’s what makes ram’s horn special:

  • Unique seed pods: Those curved, horn-like pods are perfect for dried flower arrangements and craft projects
  • Drought tolerance: Once established, this tough plant can handle dry conditions like a champ
  • Low maintenance: As an annual, it doesn’t require long-term commitment or complex care
  • Pollinator friendly: The flowers provide nectar for bees and other beneficial insects
  • Conversation starter: Your neighbors will definitely ask about those weird pods!

What Does It Look Like?

Ram’s horn develops large, heart-shaped leaves that create a bushy, sprawling appearance. The plant can get quite substantial, so give it some room to spread. The flowers are tubular and appear throughout the growing season, but they’re really just the opening act for the main event – those spectacular seed pods that develop as the season progresses.

Growing Conditions and Care

The good news is that ram’s horn is pretty easygoing once you understand its preferences:

  • Sunlight: Full sun is essential for best growth and pod development
  • Soil: Well-draining soil is crucial – this plant doesn’t like wet feet
  • Water: Moderate water when young, but drought tolerant once established
  • Hardiness: Grows as an annual in USDA zones 3-10

Planting and Care Tips

Growing ram’s horn successfully is pretty straightforward if you follow these guidelines:

  • Direct sow: Plant seeds directly in the garden after the last frost date
  • Space generously: These plants can spread, so give them 2-3 feet between plants
  • Water wisely: Keep soil moist during germination, then reduce watering as plants establish
  • Be patient: The exciting seed pods develop later in the season, so don’t give up if early growth seems slow
  • Harvest timing: Collect pods when they’re fully mature but before they split open naturally

Garden Design Ideas

Ram’s horn works best in specialty situations rather than formal flower borders. Consider these placement ideas:

  • Craft gardens where you grow plants specifically for dried arrangements
  • Children’s gardens for the novelty factor
  • Xeriscaping or drought-tolerant landscapes
  • Back corners where the spreading habit won’t overwhelm other plants
  • Cutting gardens focused on unique materials rather than traditional flowers

The Bottom Line

Ram’s horn isn’t for every garden or every gardener. If you’re looking for showy flowers or compact, tidy plants, this probably isn’t your match. But if you love quirky, unique plants that serve a purpose beyond just looking pretty, ram’s horn might be exactly what you’re looking for. Those seed pods really are something special, and the plant’s drought tolerance makes it a practical choice for water-wise gardens.

Just remember – this is a plant with a purpose. Grow it for the pods, enjoy the pollinator benefits as a bonus, and prepare for plenty of questions from curious visitors!

Ram’s Horn

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

Pedaliaceae R. Br. - Sesame family

Genus

Proboscidea Schmidel - unicorn-plant

Species

Proboscidea louisianica (Mill.) Thell. - ram's horn

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