Rose Moss

Portulaca grandiflora

Native to:
Argentina, Bolivia, Brazil, Guam, Palau, Paraguay, Peru, Uruguay

📍 View on iNaturalist →

Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Portulacaceae
Genus:
Portulaca
Species:
Portulaca grandiflora
USDA Symbol:
POGR7

Growth Characteristics

Life Cycle:
Annual
Growth Habit:
Forb/herb
Height:
20 cm
Light Requirements:
Full Sun
Drought Tolerance:
High
Bloom Months:
jun,jul,aug,sep,oct
Bloom Colors:
white, yellow, pink, purple, red, orange, magenta
Ground Cover:
Yes

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)
Butterflies & Moths:
★☆☆☆☆ Documented Lepidoptera association (GBIF)
Caterpillars:
★☆☆☆☆ Recorded caterpillar host plant (HOSTS Database)

Host Plant for Caterpillars

Glover's Silkworm Moth (Euscirrhopterus gloveri), Green Cutworm (Anicla infecta), Lucerne Moth (Nomophila nearctica), rascal dart moth (Agrotis malefida), White-lined sphinx moth (Hyles lineata)

Reported Fauna Sightings

Bees: Two-spotted Longhorn (Melissodes bimaculatus)

Garden & Ecology Notes

Wildlife Value:
bees, butterflies
Deer Resistant:
Yes
Salt Tolerant:
Yes

Soil Requirements

Soil Type:
sandy, well-drained, nutrient-poor soil
pH:
5.5 - 7.5 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
thrives in poor, arid conditions

Propagation & Germination

Stratification:
None required
Germination Time:
7–21 days
Notes:
Seeds require light for germination; surface sow and do not cover. Warm temperatures (70-85°F) promote best germination.

The above propagation data sourced from Claude AI

ORGHPS Germination Guide: Sow @ 20C. Germinates within 3 months.

Source: Ontario Rock Garden & Hardy Plant Society