How to Grow Moss Rose
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Moss Rose
Portulaca grandiflora
flowerMoss rose is a tender annual succulent known for its vibrant, papery flowers that resemble miniature roses in shades of pink, red, orange, yellow, and white. The plant features thick, fleshy foliage and low, spreading growth, making it excellent for edging, containers, and rock gardens. It thrives in hot, dry conditions and requires minimal maintenance once established.
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Example Moss Rose timeline · Pittsburgh, PA (Zone 6b)
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Plant Moss Rose
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 Moss Rose blooms
Around Jun 6≈ 50 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Moss Rose dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 2-11 as an annual; perennial in zones 10-11
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Germination
10-14 daysTiny seedlings emerge with narrow succulent leaves, very slow to develop initially.
Keep soil lightly moist but not wet. Provide warmth (70-75°F) and bright light. Germination takes 10-14 days.
Seedling/Early Growth
2-3 weeksPlants develop their characteristic fleshy foliage in tight clusters, remaining very compact and low.
Gradually reduce watering as plants mature. Begin light fertilizing with diluted balanced fertilizer. Harden off transplants before moving outdoors.
Vegetative Expansion
2-3 weeksPlants fill out horizontally with dense mats of thick, succulent leaves; growth remains prostrate or slightly mounding.
Minimal supplemental watering needed. Avoid overfeeding; excess nitrogen reduces flowering. Pinching is rarely necessary.
Flowering
8-12 weeks or until frostAbundant small, rose-like flowers appear continuously from mid-summer through fall, opening in bright sunlight and closing at dusk.
Maintain full sun exposure for best blooming. Deadheading is optional; plants self-clean well. Water only during extended drought.
Senescence/Frost Kill
Until first frostPlants decline and blacken with first frost in cooler zones; growth stops as temperatures drop.
Plants are annuals in most zones; allow to die or remove and compost. In zones 10-11, may overwinter; cut back for regrowth.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use miticide if severe. Improve air circulation to prevent infestations.
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Spray with insecticidal soap or neem oil. Strong water spray can also help control populations.
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Use yellow sticky traps; spray with insecticidal soap or neem oil if population is heavy.
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Ensure excellent drainage; allow soil to dry between waterings. Remove infected plants; do not overwater.
Uses
Edible Flowers
CulinaryMoss rose flowers are edible with a mild, slightly sweet flavor and can be used as a delicate garnish for salads or desserts. [source]
Container & Landscaping Ornament
HouseholdIdeal for hanging baskets, containers, rock gardens, and hot, dry borders where traditional flowers struggle. Its trailing habit makes it perfect for edges and mass plantings. [source]
Traditional Plant Uses
MedicinalIn some traditional medicine systems, Portulaca species have been used for their cooling properties and to treat skin conditions, though scientific evidence is limited. [source]
Pollinator-Friendly
WildlifeThe bright flowers attract bees and other pollinators, supporting local ecosystems while providing continuous blooms throughout summer and fall. [source]
Dried Flower Arrangements
CraftFlowers and seed capsules can be dried for long-lasting decorative arrangements and crafts. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Moss rose is grown for ornamental flowers, not harvest. Deadheading spent blooms is optional but encourages continued flowering. To collect seeds, allow some flowers to fade and mature into small seed capsules; harvest when dry and brown, then allow to fully dry indoors before storing.
Fun Facts
- 🌱 Moss rose flowers famously close at night and on cloudy days, reopening when the sun returns—a behavior called nyctinasty.
- 🌱 The plant is also known as 'Eleven o'clock flower' because its blooms typically close around that time each afternoon.
- 🌱 Moss rose is a succulent relative of common purslane (Portulaca oleracea), a nutritious edible weed that shares similar hardiness and drought tolerance.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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