How to Grow Shirley Double Mixed Poppy
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Shirley Double Mixed Poppy
Papaver rhoeas
flowerShirley Double Mixed is a cultivated variety of corn poppy featuring fully double blooms in a vibrant mix of red, pink, white, and bicolor patterns. These delicate, tissue-paper-like flowers grow on slender stems and create a cottage garden aesthetic. The plants are cool-season annuals that bloom prolifically in spring and early summer.
When should you plant Shirley Double Mixed Poppy in your zone?
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Example Shirley Double Mixed Poppy timeline · Pittsburgh, PA (Zone 6b)
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Plant Shirley Double Mixed Poppy
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Shirley Double Mixed Poppy blooms
Around Jun 1≈ 45 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Shirley Double Mixed Poppy dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 2-9; performs best in cooler zones (2-7) and as cool-season annual in warm zones
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Get my Shirley Double Mixed Poppy timeline →Growth Stages
Germination
7-14 daysTiny seedlings emerge with delicate cotyledons (seed leaves). Plants are very tender and vulnerable at this stage.
Keep soil consistently moist but not waterlogged. Provide bright light and cool temperatures (55-65°F). Thin seedlings to proper spacing as soon as they develop their first true leaves.
Seedling & Early Growth
2-3 weeksPlants develop feathery, finely divided foliage characteristic of poppies. Multiple stems begin forming. Plants remain relatively low and compact.
Maintain cool conditions; avoid overwatering which promotes disease. Fertilize lightly if needed with diluted balanced fertilizer. Ensure adequate spacing to prevent damping-off disease.
Stem Elongation & Budding
2-3 weeksPlants grow taller on slender, leafy stems. Flower buds begin forming at the branch tips, appearing as small green nodules.
Provide support with thin stakes if plants are in windy locations. Continue moderate watering at soil level. Do not fertilize heavily; excess nitrogen reduces flowering.
Flowering
3-6 weeks (extends with deadheading)Buds open into spectacular fully double blooms with ruffled petals in red, pink, white, salmon, and bicolor combinations. Peak flowering period with continuous blooming.
Deadhead spent flowers regularly to encourage continuous blooming. Water at base only. Provide cool temperatures (below 75°F) for longest bloom period. Support tall stems if necessary.
Decline & Seed Production
2-4 weeksAs temperatures warm in late spring/summer, flowering slows. If flowers are left unharvested, seed pods develop and mature to brown papery capsules.
Allow some flowers to mature into seed pods if you want to collect seeds for next year. Stop deadheading designated seed pods. Remove spent plants if desired for fall plantings in mild climates.
Common Pests
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Spray with water to dislodge; use insecticidal soap or neem oil if severe. Encourage beneficial insects like ladybugs.
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Increase humidity by misting; spray with water or use miticide if heavily infested. Ensure adequate air circulation.
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Improve air circulation; avoid overhead watering. Use sulfur spray or fungicide if severe. Remove infected leaves.
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Ensure excellent drainage; avoid waterlogging. Remove affected plants. Use well-draining soil mix.
Uses
Culinary & Decorative Edible Flowers
CulinaryShirley poppy petals are edible and used to garnish salads, desserts, and beverages for their stunning visual appeal. The petals offer mild floral notes and are completely safe (unlike opium poppy species). [source]
Cut Flowers & Floral Arrangements
CraftThese are exceptional cut flowers for cottage garden arrangements, wedding bouquets, and fresh floral displays. Their delicate double blooms and range of colors make them highly prized by florists and home gardeners. [source]
Pressed Flowers & Crafts
HouseholdThe delicate petals dry beautifully when pressed between paper, making them ideal for scrapbooking, card-making, and decorative crafts. The dried petals retain vibrant colors for months. [source]
Pollinator Support
WildlifePoppies are excellent nectar and pollen sources for bees, hoverflies, and other pollinators during their spring bloom season. The accessible flower centers make them particularly valuable for early-season pollinators. [source]
Traditional Herbal Use
MedicinalCommon poppies have been used in traditional medicine as mild sedatives and for respiratory support. Modern use is primarily as ornamental, though petals are sometimes used in herbal teas for relaxation. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut flowers in the early morning when buds are fully colored but just beginning to open for longest vase life. Sear the cut stem ends with a flame to prevent the milky sap from clogging the stem and allowing water absorption. Flowers last 3-5 days in a vase with fresh water changed daily. Allow some flowers to mature into seed pods (2-3 weeks after petal drop) to collect seeds; harvest brown, papery pods, dry completely, and store seeds in a cool, dry place for next season.
Fun Facts
- 🌱 Shirley poppies were developed in the 1880s by Reverend Wilks of Shirley, England, who selectively bred corn poppies to produce fully double flowers, creating one of the most dramatic transformations in flower breeding history.
- 🌱 Unlike opium poppies (Papaver somniferum), Shirley poppies and corn poppies are completely non-narcotic and legal to grow in all locations; they produce no notable alkaloids.
- 🌱 Poppy seeds can remain viable in the soil for over 30 years, so a single planting can result in volunteer flowers for decades—a quality that made poppies famous for blooming in disturbed WWI battlefields.
Gardening Terms
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