Petunia parviflora
This name now applies to Calibrachoa parviflora, commonly called seaside petunia. It is a small‑flowered wild species that creeps and roots at the nodes. It stands out for tiny purple to pink axillary blooms and a tough habit in sandy, disturbed sites. Garden use is uncommon, but plants can be trialed in containers or naturalistic plantings. It performs best in full sun with sharply drained, slightly acidic media. Most North American growers should handle it as a warm‑season annual.
At‑a‑glance
- Group/Class: species (currently placed in Calibrachoa)
- Height × spread: 2 to 10 in (5 to 25 cm) × 12 to 24 in (30 to 60 cm)
- Bloom window: spring to early fall, depending on climate
- Color & flower form: very small purple to pink, axillary, funnel‑shaped
- Fragrance: unknown
- USDA hardiness: grown as annual in most regions
- Breeder / Year / Origin: wild species, South America; naturalized in parts of the U.S.
- Pet safety: unknown
How it differs
- Much smaller flowers than garden petunias.
- Creeping, mat‑forming habit with stems that root at nodes.
- Taxonomically treated as Calibrachoa rather than Petunia by Kew.
- Often found in sandy or coastal habitats rather than flower beds.
Strengths
- Handles sandy, disturbed soils.
- Low habit suits shallow containers and rock edges.
- Blooms over a long warm season with sun and feed.
Care in one minute
- Grow in full sun for best flowering.
- Use sharply drained, sandy or soilless mixes; keep evenly moist but not wet.
- Maintain slightly acidic pH; avoid alkaline irrigation water.
- Fertilize lightly and regularly through the season.
- Shear if the mat becomes sparse to prompt new growth.
Watch‑outs
- Can self‑seed and behave weedy in some sites.
- Very sensitive to high pH media; iron chlorosis can develop.
- Not widely available in the trade.
Best uses (tags)
containers, groundcover, rock gardens, coastal, naturalistic
Provenance note
Formerly Petunia parviflora; accepted as Calibrachoa parviflora by Kew. In North America it occurs in sandy and coastal habitats and disturbed sites.
References
- Kew Science POWO – Calibrachoa parviflora (syn. Petunia parviflora)
- Flora of North America – Calibrachoa parviflora
- USDA Plants – Calibrachoa parviflora
- University of Minnesota Extension – Calibrachoa
Written by: Your Flowers Guide editorial team
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