How to Grow Shirley Double Carmine
Wikimedia Commons
Shirley Double Carmine
Papaver rhoeas 'Shirley Double Carmine'
flowerShirley Double Carmine is a stunning double-flowered poppy cultivar featuring vibrant carmine-red blooms with ruffled, tissue-paper-like petals. This ornamental variety is a selected form of the common poppy, prized for its dramatic color and full, pompom-like flower structure. It's an annual that adds bold color and textural interest to gardens and cut flower arrangements.
When should you plant Shirley Double Carmine in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Shirley Double Carmine timeline · Pittsburgh, PA (Zone 6b)
-
Plant Shirley Double Carmine
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
First Shirley Double Carmine blooms
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Shirley Double Carmine dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-9; prefers cool to moderate climates
Sign up free to see if Shirley Double Carmine grows in your zone — and get a personalized planting timeline.
Get my Shirley Double Carmine timeline →Growth Stages
Germination
1-2 weeksSeeds sprout and develop first true leaves within 7-10 days. Seedlings appear delicate with fine foliage.
Keep soil lightly moist; ensure good light exposure. Provide cool conditions (60-65°F ideal). Thin seedlings to proper spacing early to reduce transplant stress.
Vegetative Growth
3-4 weeksPlant develops feathery, finely-divided foliage in blue-green color. Bushy growth 12-24 inches tall depending on variety.
Water moderately; allow soil surface to dry between waterings. Avoid excessive nitrogen fertilizer which promotes foliage over flowers. Minimal staking needed.
Budding
1-2 weeksCharacteristic hairy buds form at stem tips, held upright on sturdy stems. Buds are distinctly visible and swollen with developing petals.
Maintain consistent, moderate watering. Do not overwater. Buds may face downward before opening. Avoid handling buds to prevent damage.
Flowering
2-3 weeks per flower; succession blooming over 4-6 weeksSpectacular double carmine-red flowers with ruffled petals open, often with darker markings. Flowers are full and pompom-like, 3-4 inches across. Petals are delicate and papery.
Deadhead spent flowers to encourage continued blooming. Water at soil level to avoid wetting petals. Provide afternoon shade in very hot climates (zone 8-9). Cut flowers for arrangements in early morning.
Seed Development & Decline
2-3 weeksFlowers fade; if not deadheaded, seed pods swell and mature to tan/brown papery capsules. Plant growth slows; flowering decreases.
Allow some flowers to remain for self-seeding if desired. Save seed pods once they turn brown and dry. Pull plants once flowering has completely ceased to encourage composting.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Spray with water to dislodge; use insecticidal soap if severe. Encourage beneficial insects like ladybugs.
-
Increase humidity by misting; spray with water. Use miticide if population is high. More common in hot, dry conditions.
-
Ensure good air circulation; avoid overhead watering. Apply fungicidal sulfur spray if needed. Often self-limiting in airy garden settings.
-
Remove affected foliage; improve air circulation. Avoid wetting foliage. Rarely severe on poppies.
Uses
Ornamental garnish and aesthetic appeal
CulinaryWhile Shirley Double Carmine poppies are primarily ornamental and not typically consumed, they are popular in high-end floral presentations and specialty floristry, particularly for upscale events and artistic arrangements. [source]
Cut flowers and floral arrangements
CraftShirley Double Carmine is prized by florists and flower arrangers for its dramatic double blooms, vibrant carmine color, and textural interest. The flowers bring bold color and a cottage-garden aesthetic to fresh and dried arrangements. [source]
Dried flowers and seedpods
CraftThe papery seed pods (pepper-pot shaped capsules) are excellent for dried flower arrangements and craft projects. They can be harvested when completely dry for long-lasting decorative displays. [source]
Garden ornamentation and pollinator attraction
HouseholdShirley Double Carmine provides spectacular seasonal color to gardens, borders, and cottage-style landscapes. The flowers attract bees, butterflies, and other pollinators, supporting garden biodiversity. [source]
Food source for pollinators
WildlifePoppies are visited by bees and beneficial insects that feed on pollen. Even double varieties with less accessible pollen than singles still attract pollinators seeking nectar and available pollen. [source]
Harvest Tips
Cut flowers in early morning when buds have just opened or fully opened. Use sharp scissors and remove lower leaves from stems. Place immediately in cool water. Flowers last 5-7 days in a vase. For seeds, allow pods to dry completely on the plant until they turn papery brown and shake-release seeds; collect in late summer when dry.
Fun Facts
- 🌱 The 'Shirley' strain of poppies was developed in Shirley, England in the 1880s, where an amateur gardener selected and bred poppies with increasingly doubled petals and extended color ranges, eventually resulting in varieties like Shirley Double Carmine.
- 🌱 Poppy seed pods (poppyheads) have been used for centuries in dried arrangements and are famously depicted in art and poetry; their geometric pepper-pot shape is instantly recognizable and highly valued by florists.
- 🌱 Despite the dramatic appearance of double-flowered poppies, they typically produce little to no viable seed compared to single-flowered varieties, which is why the Shirley strain requires regular seed collection to maintain true-to-type plants.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Shirley Double Carmine planting timeline
Tell us your zip code and we'll calculate exactly when to start Shirley Double Carmine seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Shirley Double Carmine timeline →