Volcanic Sorrel, scientifically known as Oxalis vulcanicola, is a vibrant and captivating plant that adds a touch of unique beauty to any setting. Its distinctive appearance, characterized by colorful foliage and cheerful flowers, has contributed to its growing popularity among gardeners and plant enthusiasts. This versatile plant offers both ornamental charm and practical uses, making it a desirable addition to various plant collections.
Identifying Volcanic Sorrel
Volcanic Sorrel is recognized by its distinctive clover-like leaves, often displaying a rich purplish-bronze or burgundy hue, though some cultivars can exhibit gold, orange, pink, or coppery-yellow shades. These leaves are typically small, about three-quarters of an inch wide, and grow in clusters. Delicate, five-petaled yellow flowers emerge on slender stems, often an inch or two above the foliage, sometimes featuring red lines in their throats.
This perennial plant forms a low, mounding mat with semi-succulent stems that can trail or cascade. It usually reaches a height of 6 to 10 inches and can spread up to 12 inches or more. Native to montane forests in Central and South America, Oxalis vulcanicola thrives at elevations of 4,600 to nearly 11,000 feet. Its common name comes from its initial collection near Costa Rica’s Irazú Volcano.
Growing Volcanic Sorrel
Volcanic Sorrel thrives in bright, indirect light, though it can tolerate partial sun. In hotter climates, it benefits from protection against harsh afternoon rays to prevent leaf scorch. For indoor cultivation, a window facing the morning sun provides ideal conditions, as the glass filters intense light.
Consistent moisture is important for Volcanic Sorrel, which prefers its soil to remain evenly moist but not waterlogged. Allow the top quarter-inch of soil to dry before rewatering to prevent root rot. While it can tolerate brief dry spells, regular watering helps maintain its lush foliage.
The plant prefers well-draining soil rich in organic matter, with a neutral to slightly acidic pH between 6.0 and 6.5. A store-bought potting mix works well for container growing. Volcanic Sorrel flourishes in warmer conditions, ideally between 60°F and 75°F. It also appreciates moderate humidity, and misting can help.
During its active growing season in spring and summer, Volcanic Sorrel benefits from monthly feeding with a balanced, water-soluble liquid fertilizer at half strength. It is a light feeder, so avoid over-fertilization, which can lead to salt buildup and foliage burn. Propagation is straightforward through division of its tuber clusters or by taking stem cuttings.
Culinary and Other Uses
Volcanic Sorrel’s leaves and flowers are edible, offering a distinct tart, lemony flavor that can enhance various dishes. The leaves are commonly used in salads, as a garnish, or to add a bright, zesty accent to recipes. Some individuals also use the leaves to make a refreshing tea.
Beyond its culinary applications, Oxalis vulcanicola is valued for its ornamental appeal. Its compact growth habit and striking foliage make it an excellent choice for groundcover, especially in shaded areas. It is also widely used as a container plant or in hanging baskets, where its trailing stems can cascade attractively over edges.
Important Considerations
Like other sorrels, Volcanic Sorrel contains oxalic acid, which imparts its characteristic tart flavor. While generally safe for consumption in moderation, large quantities of oxalic acid can be harmful, particularly for individuals prone to kidney stones or with other related health conditions. It is advisable to consume it sparingly and as part of a varied diet.
Volcanic Sorrel is toxic to pets if ingested, with symptoms ranging from vomiting and diarrhea to kidney failure. Common pests include aphids, slugs, and snails. Fungal issues such as leaf spots, powdery mildew, and rust can also affect the plant.