Seaside petunia
Also known as
Small-flowered calibrachoa, Smallflower petunia, Trailing calibrachoa
Keep this plant’s care guide close at hand.
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Calibrachoa parviflora is a low, mat-forming perennial in the nightshade family (Solanaceae), native to temperate South America and widely naturalized in warm regions. It produces slender, creeping to trailing stems that root at the nodes, creating dense ground-hugging patches. Opposite leaves are small, spatulate to oblanceolate, and often sticky with fine glandular hairs. The funnel-shaped flowers are petite (typically 1–1.5 cm wide), violet to purple with a pale or yellowish throat, and bloom over a long season in mild climates. The species is more diminutive and less floriferous than the widely cultivated Calibrachoa hybrids, but it is tough, salt-tolerant, and adaptable to sandy, well-drained soils. In gardens, it can serve as an informal groundcover, rock-garden subject, or spiller in containers and hanging baskets in frost-free areas. It attracts small bees and hoverflies. In cooler climates it is best treated as a warm-season annual, as frost readily damages growth and sustained flowering requires high light and consistent nutrition.
Taxonomy
Properties & Requirements
How to care for Seaside petunia
Water
Water deeply, then allow the top 1–2 cm of soil to dry before watering again. In containers, this may mean watering every 1–2 days during hot, windy weather and less often during cool spells. Always ensure rapid drainage; never leave the pot standing in a saucer of water. Morning watering helps foliage dry quickly and reduces disease pressure. In the ground, establish with regular moisture for several weeks; once rooted, it tolerates brief dryness but flowers best with steady, moderate moisture.
Light
Provide full sun for 6–8+ hours daily to sustain compact growth and abundant bloom. In very hot climates, light afternoon shade helps prevent stress and reduces irrigation demand, but too much shade leads to lanky stems and sparse flowers. Indoors or in greenhouses, supplemental lighting to 12–14 hours can maintain flowering. Ensure good air movement to limit fungal issues, particularly when humidity is high or plants are grown densely.
Nutrients
Feed regularly for continuous growth and bloom. Mix a slow-release, balanced fertilizer (e.g., 12-12-12 or 14-14-14) into potting media at planting, then supplement every 1–2 weeks with a liquid feed leaning higher in potassium (e.g., 1:2:2 ratio) at 1/4–1/2 strength. Maintain slightly acidic conditions to prevent iron chlorosis; if new leaves pale/yellow with green veins, apply chelated iron. Flush containers monthly with clear water to prevent salt buildup, and avoid high-alkalinity water or limey soils.
Temperature
Best as a warm-season perennial (or annual in cool climates). Ideal growth occurs between 15–27°C (60–80°F). It tolerates heat into the low 30s °C (mid-80s to low 90s °F) if well watered and not waterlogged. Growth slows below 10–12°C (50–54°F), and frost will damage or kill top growth. In cold-winter areas, overwinter cuttings indoors in a bright, cool spot (10–15°C / 50–59°F), keeping the medium only lightly moist.
