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Oxalis Care Guide

Oxalis triangularis

By Learn Plant Care·Toxicity verified via ASPCA
Oxalis (Oxalis triangularis)
Oxalis (Oxalis triangularis) · Via Wikimedia Commons (CC)

Quick Answer

Oxalis needs watering every 1–2 weeks in summer and every 2–3 weeks (or dormant — skip) in winter. It thrives in bright indirect to direct and temperatures of 55–80°F. Difficulty: Easy. ⚠️ Toxic to pets — keep away from cats and dogs.

Difficulty

Easy

Light

Bright indirect to direct

Watering

Every 1–2 weeks

Humidity

Medium (40–60%)

Temperature

55–80°F

Growth Rate

Fast

Toxicity

⚠️ Toxic to Cats⚠️ Toxic to Dogs✅ Safe for Humans

Source: ASPCA Animal Poison Control

Watering

Summer

Every 1–2 weeks

Winter

Every 2–3 weeks (or dormant — skip)

Method: Allow top inch to dry

Light Requirements

Bright indirect to direct

Needs bright light to open and display leaves fully.

Soil & Potting

Soil: Well-draining potting mix

Pot: Any pot with drainage

Temperature & Humidity

Temperature: 55–80°F (13–27°C)

Humidity: Medium (40–60%)

Fertilizing

Frequency: Monthly spring/summer

Type: Balanced fertilizer, half strength

Common Problems

Leaves closing → Normal! Leaves open with light, close in dark.

Yellowing leaves → Going dormant. Normal. Reduce watering.

Wilting → Underwatering or dormancy starting.

No growth → Normal dormancy. Keep cool and dry for 4–8 weeks then resume.

Propagation

Division of bulbs/corms

Seasonal Care Calendar

🌸 Spring

Excellent time to restart from bulbs after dormancy. Resume watering.

☀️ Summer

Peak growth and flowering. Water and fertilize consistently.

🍂 Fall

May go dormant in heat. Reduce watering; allow leaves to die back naturally.

❄️ Winter

Allow dormancy if needed. Resume watering for new growth as light improves.

Frequently Asked Questions

Why do my oxalis leaves close at night?▾
Normal nyctinasty — leaves fold in low light and reopen in bright light. Not a sign of stress.
How often should I water oxalis?▾
Every 1–2 weeks during growing season. Stop watering when leaves die back for dormancy.
How do I handle oxalis dormancy?▾
When leaves die back (usually summer heat or winter cold), reduce watering and let rest 4–8 weeks. Resume when new growth appears.
Is oxalis invasive outdoors?▾
Some species are highly invasive outdoors — keep it in containers if you live in a mild climate.
Is oxalis toxic to pets?▾
Mildly toxic — oxalic acid causes GI upset and, in large amounts, kidney issues in cats and dogs (ASPCA).