North America Non-native Plant

Long Pricklyhead Poppy

Botanical name: Papaver argemone

USDA symbol: PAAR3

Life cycle: annual

Habit: forb

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

Long Pricklyhead Poppy: A Delicate European Wildflower for Your Garden If you’ve ever stumbled across tiny red poppies growing wild in disturbed soil or along roadsides, you might have encountered the long pricklyhead poppy (Papaver argemone). This charming little annual brings a touch of European countryside charm to North American ...

Long Pricklyhead Poppy: A Delicate European Wildflower for Your Garden

If you’ve ever stumbled across tiny red poppies growing wild in disturbed soil or along roadsides, you might have encountered the long pricklyhead poppy (Papaver argemone). This charming little annual brings a touch of European countryside charm to North American gardens, though it comes with some considerations for the native plant enthusiast.

What is Long Pricklyhead Poppy?

Long pricklyhead poppy is a delicate annual forb—essentially a non-woody flowering plant that completes its entire life cycle in one growing season. Despite its somewhat intimidating name, this poppy is actually quite petite, producing small red flowers that are typically just 1-2 centimeters across. The pricklyhead part of its name refers to its distinctive seed pods, which are covered in bristly hairs.

Native Status and Distribution

Here’s where things get interesting from a native gardening perspective. Long pricklyhead poppy isn’t actually native to North America—it’s an introduced species that originally hails from Europe and western Asia. However, it has naturalized across many states and has been reproducing on its own in the wild without human intervention.

You can currently find established populations of long pricklyhead poppy across a surprisingly wide range of locations, including British Columbia, California, Connecticut, Idaho, Maryland, Michigan, Montana, New York, Ohio, Oregon, Pennsylvania, Utah, Virginia, and Washington.

Should You Grow Long Pricklyhead Poppy?

This is where the decision gets a bit nuanced. While long pricklyhead poppy isn’t listed as invasive or noxious, its non-native status means it won’t provide the same ecological benefits as native wildflowers. Here are some factors to consider:

Reasons You Might Want to Grow It:

  • Charming, delicate red flowers that add wildflower appeal
  • Thrives in poor, disturbed soils where other plants struggle
  • Requires virtually no maintenance once established
  • Self-seeds readily for natural-looking displays
  • Provides some pollinator value for small bees and flies

Reasons You Might Skip It:

  • Non-native status means limited wildlife and ecological benefits
  • Can self-seed aggressively in optimal conditions
  • Short bloom period compared to many native alternatives
  • May compete with native wildflowers in natural areas

Native Alternatives to Consider

If you’re drawn to the delicate charm of long pricklyhead poppy but prefer native options, consider these beautiful alternatives that offer similar appeal with greater ecological benefits:

  • Native regional poppy species (varies by location)
  • Wild bergamot (Monarda fistulosa) for red-pink flowers
  • Scarlet pimpernel alternatives native to your region
  • Native annual wildflower mixes suited to your area

How to Grow Long Pricklyhead Poppy

If you decide to include long pricklyhead poppy in your garden, the good news is that it’s refreshingly easy to grow—perhaps sometimes too easy!

Growing Conditions:

  • Soil: Prefers sandy, well-drained soils but tolerates poor conditions
  • Sun: Full sun for best flowering
  • Water: Drought tolerant once established; avoid overwatering
  • USDA Zones: Hardy in zones 3-9 where established populations exist

Planting and Care Tips:

  • Sow seeds directly in early spring or late fall
  • Barely cover seeds as they need light to germinate
  • No fertilizer needed—actually prefers lean soils
  • Deadhead flowers to prevent excessive self-seeding if desired
  • Allow some plants to go to seed for next year’s display

A Balanced Approach

Long pricklyhead poppy occupies an interesting middle ground in the gardening world. While it’s not native, it’s also not considered problematically invasive in most areas where it’s established. If you’re creating a wild garden or working with disturbed soil where few other plants thrive, it can provide color and interest with minimal effort.

However, if your goal is supporting native ecosystems and local wildlife, you’ll get more ecological bang for your buck by choosing native wildflowers that have co-evolved with local pollinators and other wildlife. The choice ultimately depends on your gardening goals and personal preferences.

Whatever you decide, remember that successful native gardening is about making informed choices that align with your values and garden conditions. Long pricklyhead poppy might just be the right fit for that challenging spot where nothing else will grow—or it might inspire you to seek out an equally charming native alternative.

Long Pricklyhead Poppy

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Magnoliidae

Order

Papaverales

Family

Papaveraceae Juss. - Poppy family

Genus

Papaver L. - poppy

Species

Papaver argemone L. - long pricklyhead poppy

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