When to Plant
In gardens, planting typically happens in spring (after the last frost) for better growth, especially in cooler climates. In warmer zones, planting may be done in autumn or even year-round where winters are mild. Indoor varieties can be planted anytime under controlled conditions.
Where to Plant
Select a site with full sun to partial shade. Many oxalis types appreciate bright light but can suffer in harsh midday sun in warmer climates. The soil or potting mix must be well-draining—the bulbs dislike sitting in soggy ground, which leads to rot.
Preparing the Soil
Loosen the topsoil to about 10–15 cm, removing rocks and compacted bits. Enrich it with compost or organic matter if the soil is poor. In heavy soils, mix in coarse sand, perlite, or grit to enhance drainage and breakdown.
Planting the Corms
Place the corms vertically, with the narrow (tapered) end facing upward. Cover them with soil so that the top is around 2.5 to 4 cm (1 to 1½ inches) deep. Space each corm roughly 7–10 cm apart so they have room to grow and multiply. In containers, use a pot with drainage holes and fill with a free‑draining potting mix before planting.
After Planting
Water gently to settle the soil around the corms—but don’t overwater. Keep soil slightly moist but avoid saturation. New growth often appears in 2 to 4 weeks, and flowering may follow after a while.
Spring Growth and Blooming
Leaves emerge first, forming the distinctive shamrock shape. Flowers follow on slender stems, often opening during the day and closing at night. During active growth, maintain moderate watering and avoid letting the soil dry out completely.
After Blooming
Let the foliage die back naturally; don’t prune it prematurely. This allows the bulbs to store energy for next season. Once leaves fully wither, you can gently clean the area. In colder climates or for outdoor varieties, corms may be lifted and stored during dormancy and replanted later.
Extra Growing Tips
Oxalis multiplies readily by corm division—every few seasons you can divide to maintain vigor or increase numbers. In colder regions, you may keep, lift, and store bulbs over winter. Because of their small size and delicate form, mass plantings or clusters produce the greatest visual impact. Also, be cautious: many oxalis species are mildly toxic if ingested, so avoid planting where pets or children may dig.
