Lobelia pedunculata: A Carpet of Blue Stars
Lobelia pedunculata, commonly known as Little Star Creeper or Blue Star Creeper, is a charming and resilient groundcover that offers a fine-textured carpet of green foliage adorned with pale blue flowers. Once classified under the genus Pratia, this vigorous perennial now sits comfortably within the Lobelia genus in the Campanulaceae (Bellflower) family. Native to Australia and New Zealand, this dainty yet tenacious plant is a favorite for filling gaps in rock gardens, softening edges between pavers, and trailing over low walls.
Botanical Classification and Origins
Lobelia pedunculata previously Pratia pedunculata belongs to the family Campanulaceae, often called the bellflower family. Though it was previously in its own genus Pratia, it has since been reclassified under Lobelia based on botanical consensus. Robert Brown first described the species based on specimens collected from Hunter’s River in New South Wales in 1801. Its natural habitats include moist meadows, damp stream banks, and shaded woodland margins in Australia and New Zealand.
Description and Features of Lobelia pedunculata
This low-growing perennial herb forms a dense, creeping mat that hugs the ground, reaching just 2-3 cm (0.8-1.2 in.) in height. Its bright green, nearly stemless leaves measure approximately 0.6 cm (0.25 in.) across and form a lush backdrop for the star attraction: masses of small, star-shaped flowers. The flowers appear in late spring and can continue through summer, occasionally reblooming in autumn. Each delicate blossom is pale to bright blue, with a five-pointed shape and gentle lavender undertones.
Some cultivars offer variation in flower color, such as:
- ‘Alba’ – with pure white blooms
- ‘County Park’ – noted for deeper blue shades and slightly taller growth
- ‘Little Star’ – celebrated for a compact habit and abundant flowering
This species spreads via underground stolons and above-ground runners, enabling it to fill in spaces quickly. While evergreen in mild climates, it may die back partially or entirely in colder winters, reemerging with vigor in spring.
Growing Conditions for Lobelia pedunculata
Light Requirements
Lobelia pedunculata or Pratia pedunculata thrives in full sun to partial shade. In cooler climates, full sun promotes compact growth and prolific blooming. In hotter regions, especially areas with intense afternoon sun, partial shade can prevent leaf scorching and conserve soil moisture.
Soil Preferences
This plant is not overly fussy about soil, growing well in sandy, loamy, or even clay-rich soils as long as they drain well. It performs best in moist, humus-rich soil but can adapt to poorer conditions with some care. In heavy clay, incorporate compost or grit to improve drainage.
Watering Needs
Keep the soil evenly moist, particularly during hot, dry spells. While Lobelia pedunculata tolerates short dry periods once established, it does not fare well in prolonged drought or standing water. Water thoroughly when the top 2 cm (0.75 in.) of soil feels dry, and reduce watering in cooler months.
Fertilizing
This low-maintenance plant rarely requires feeding. Apply a light dose of balanced fertilizer (10-10-10) in spring. Avoid over-fertilization, as it may encourage excessive leaf growth at the expense of flowering.
Maintenance and Uses in the Garden
Lobelia pedunculata is a versatile plant suited to various landscape applications. It is often used between pavers, as a lawn substitute in low-traffic areas, or as a spillover plant in containers and rockeries. It tolerates moderate foot traffic and can be mowed lightly if needed to maintain a tidy appearance. Invasive tendencies can be controlled by edging or occasional trimming.
This species pairs beautifully with alpine plants, small ornamental grasses, and flowering bulbs. It is particularly striking cascading over walls or growing alongside mossy stones.
Wildlife and Ecological Benefits
The starry blooms of Lobelia pedunculata attract bees and other small pollinators. Its dense mat also provides shelter for beneficial insects. The plant is deer resistant and usually avoided by rabbits, making it a reliable choice for open gardens.
Propagation
This groundcover is easily propagated by division, cuttings, or stem layering. Divide clumps in spring or autumn and replant spaced about 20 cm (8 in.) apart. Runners can also be pinned down to encourage rooting at nodes.
Pests and Problems
Lobelia pedunculata is generally pest and disease-free. Slugs and snails may nibble on the tender leaves in damp conditions, but serious infestations are rare. Good air circulation and avoiding excessive watering help prevent fungal issues.
Invasiveness and Responsible Planting
Due to its spreading habit, Lobelia pedunculata can become invasive in ideal conditions, particularly in warmer regions with high humidity. Avoid planting near sensitive native habitats and monitor for encroachment. In confined gardens, use containers or physical barriers to restrict its spread.
Summary
Lobelia pedunculata previously Pratia pedunculata or (Little Star Creeper) is a fast-growing, charming groundcover that offers extended seasonal interest with minimal upkeep. With its soft mat of green leaves and a constellation of blue flowers, it creates a peaceful and naturalistic feel in any garden. While it spreads quickly, careful placement ensures its beauty without overwhelming neighboring plants. Ideal for rock gardens, flagstone paths, or shady woodland borders, this little creeper is a star performer in the right setting.
