Commelina diffusa
Commelina diffusa · Commelinaceae
The gardener's calendar
Ideal time to plant commelina diffusa: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- Tradescantia diffuse, Diffuse Dayflower
- Family
- Commelinaceae
- Type
- Annual or perennial herb depending on climate
- Foliage
- Deciduous, semi-evergreen depending on conditions
- Flowering
- Spring to autumn, small ephemeral blue flowers
- Mature size
- 20 to 50 cm in height, spreading and trailing habit
- Growth
- Fast
- Origin
- Tropical and subtropical regions of South America and Africa
- Hardiness
- Not hardy, frost-tender (0°C minimum)
- Soil type
- Humus-rich, well-draining, fertile and fresh
Care
Watering
Water regularly, keeping the substrate moist but not waterlogged, especially during the growing season. Reduce watering in winter or during dormancy. Prefer soft, non-chalky water if possible. Avoid leaving roots in stagnant moisture, as this risks root rot.
Light and exposure
Place Commelina diffusa in bright indirect light or partial shade. It tolerates shaded areas but will flower less abundantly there. Avoid direct exposure to scorching rays, especially in warm climates. It adapts well to bright indoor spaces.
Soil and potting mix
Use rich, light, well-structured potting soil enriched with organic matter. A balanced compost-soil mix promotes good growth. Ensure adequate drainage to prevent water pooling. A layer of mulch maintains soil moisture in warm climates.
Fertilizer
Apply balanced fertilizer once or twice monthly during the growing season (spring-summer). Choose a formula rich in potassium to encourage flowering. Reduce or stop fertilizing in autumn and winter. Avoid overdosing, which could damage roots.
Pruning and maintenance
Pinch terminal stems regularly to encourage bushy, branched growth. Remove dead or damaged parts as needed throughout the seasons. Light pruning in late winter rejuvenates the plant. These interventions also stimulate flowering.
Diseases and pests
Watch for spider mites and whiteflies in dry or warm conditions. Scale insects can colonize stems. Excess humidity with stagnation promotes fungal rot. Ensure good air circulation and inspect foliage regularly; isolate affected plants if necessary.
Did you know?
Commelina diffusa gets its name from the genus Commelina, dedicated to the Commelin brothers, Dutch botanists of the 16th century. Its small blue flowers are ephemeral: they open for only a single day, making it a remarkable botanical feature. This plant is widely used in tropical and subtropical gardening to fill humid and shaded areas.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- Wooly SpiderwortTradescantia sillamontana
- Asiatic dayflowerCommelina communis
- SpiderwortTradescantia fluminensis
- Ohio spiderwortTradescantia ohiensis
- Commelina cyaneaCommelina cyanea
- Commelina benghalensisCommelina benghalensis
Tips generated and checked by Viridia — adapt them to your local climate.