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Thumbnail Filmstrip of 10 Rare 'Purple Rain' Shamrock Bulbs - Easy Houseplant - Oxalis - Bulbs Images
- Growth Habit: Compact, clump-forming herbaceous perennial growing from underground corms/bulb-like structures. Typically develops a low mound of triangular purple foliage, generally around 6–12 inches tall, though plants can become larger under favorable conditions. The leaves characteristically close at night and reopen during the day. NC Extension Gardener Toolbox
- Bloom Color: Produces delicate, five-petaled pale pink, lavender-pink to nearly white flowers held on slender stems above the dark foliage. Blooming is most abundant during active growth, often from late spring or summer into fall. NC Extension Gardener Toolbox
- Fragrance: Flowers and foliage are generally not considered notably fragrant.
- Fruit Flavor: Not grown for fruit. Like other wood sorrels, the foliage has a tart, sour flavor due to its oxalic-acid content; however, because of that same compound, it should not be treated as a conventional edible crop. Missouri Department of Conservation
- Culinary Uses: Some sources describe Oxalis triangularis foliage and flowers as edible in small quantities, but the plant contains soluble oxalates. For a retail ornamental listing, I would recommend describing it as primarily ornamental and not intended for consumption, particularly because larger quantities can be harmful. NC Extension Gardener Toolbox
- Medicinal Uses: Oxalis species have a history of traditional uses, but ‘Purple Rain’ is not recommended for home medicinal use. Its oxalate content makes medicinal claims or concentrated consumption inappropriate for a general plant listing.
- Possible Toxicity: Use caution around pets and people. Oxalis triangularis contains soluble oxalates and is listed as potentially problematic for cats, dogs, and horses. Human toxicity is generally considered low, but consuming substantial quantities may cause adverse effects. Keep the plant away from pets or children likely to eat it. NC Extension Gardener Toolbox
- Wildlife & Pest Resistance: Generally considered deer- and rabbit-resistant. It may attract butterflies and other small pollinators when flowering. Spider mites can occasionally become troublesome, particularly on plants grown indoors or under stressed conditions. NC Extension Gardener Toolbox
- USDA Planting Zones: Best treated as an outdoor perennial in approximately Zones 8–11. In colder zones, grow it as an annual, lift and store the corms before freezing weather, or grow it in containers that can be moved indoors. NC Extension Gardener Toolbox
- Sun Preferences: Performs well in partial shade to bright, filtered light. Outdoor plants can tolerate some direct sun, particularly morning sun, but protection from intense afternoon heat helps prevent foliage scorch. NC Extension Gardener Toolbox
- Drought Tolerance: Moderately tolerant of short dry periods once established, but performs best with consistent moisture during active growth. Allow the upper soil surface to dry slightly between waterings and avoid soggy conditions, which can encourage corm/root rot. MU Extension
- Pruning: Very little pruning is required. Remove yellow, damaged, or spent foliage and faded flower stems near the base as needed. If the plant naturally enters dormancy and the foliage dies back, allow it to decline before cutting the dead growth to soil level. Reduce watering during dormancy until new growth appears. Integrated Pest Management
- Planting from Bulbs/Corms: Plant after the danger of hard frost has passed in loose, well-drained soil. Place the small corms approximately 1–2 inches deep, spacing them roughly 3–4 inches apart for a full display. Position the narrower/growing end upward when distinguishable. Cover gently with soil and water thoroughly. Keep the soil lightly moist, but never waterlogged, while new growth develops.
- Planting from a 3.5" Pot: Choose a location with well-drained soil and partial shade or gentle morning sun. Dig a hole about twice as wide as the root ball and approximately the same depth. Carefully remove the plant from its 3.5-inch pot, disturbing the roots and corms as little as possible. Set the plant so the top of the root ball is level with the surrounding soil. Backfill, gently firm the soil, and water thoroughly. Keep evenly but lightly moist during establishment, avoiding saturated soil.
- Cold-Climate Tip: Where winter temperatures fall below its hardiness range, dig the corms after the foliage dies back and before the ground freezes, or move container-grown plants to a protected, frost-free location. The plant's dormancy is normal, and fresh foliage generally returns once favorable growing conditions and watering resume. Integrated Pest Management
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