Purple Oxalis Flower Bulbs

Growing Purple Oxalis (Oxalis triangularis) from bulbs (actually small tubers/rhizomes) is easy, and it rewards you with striking purple leaves and delicate pink or white flowers.

1. Choose a pot and soil

• Use a pot with drainage holes.
• Fill it with a light, well-draining potting mix.
• You can mix:
  • 2 parts potting soil
  • 1 part perlite or coarse sand

2. Plant the bulbs

• Plant the bulbs about 2–5 cm (1–2 inches) deep.
• Space them 5–8 cm (2–3 inches) apart if planting several together.
• If you’re unsure which side is up, don’t worry—they usually find their way.

3. Water after planting

• Water thoroughly once after planting.
• Then keep the soil slightly moist, not soggy.
• Avoid letting the bulbs sit in water, as they can rot.

4. Provide light

• Place the pot where it gets:
  • Bright, indirect light, or
  • Morning sun with afternoon shade.
• Too much hot afternoon sun can scorch the leaves.

5. Temperature

• Ideal temperature is 15–25°C (59–77°F).
• Protect from frost.

6. Fertilize

• Once leaves appear, feed every 3–4 weeks with a balanced liquid fertilizer at half strength.
• Stop fertilizing if the plant goes dormant.

7. Dormancy (important)

Purple oxalis naturally goes dormant after several months of growth.

• Leaves may turn yellow and die back.
• Reduce watering and let the soil dry.
• Store the pot in a cool, dry place for 4–8 weeks.
• Resume watering afterward, and fresh leaves will emerge.

If planting outdoors

• Grow in well-drained soil.
• Choose a spot with morning sun and afternoon shade in hot climates.
• In areas with cold winters, lift the bulbs before frost or grow them in containers.

Growth timeline

• 1–2 weeks: Shoots begin to emerge.
• 3–6 weeks: Full foliage develops.
• 6–10 weeks: Pink or white flowers usually appear.