Light
Bright, indirect
Ideal spot
Oxalis vulcanicola 'Molten Lava' · Flowering plant
Bright, indirect
Ideal spot
about weekly
In the growing season
Easy
Fast grower
Mildly toxic
Cats & dogs
Molten Lava Oxalis (Oxalis vulcanicola 'Molten Lava') belongs to the Oxalidaceae family and is a easy houseplant to look after. This fast grower plant is happiest in bright, indirect and reaches 15–30 cm indoors.
For watering, the rule is simple: let the top dry out. In the growing season it needs water roughly every 6 days, dropping to every 14 days in winter. Use the watering calculator below to tune that rhythm to your pot size, light and household humidity.
Important: Molten Lava Oxalis is mildly toxic to pets — keep it out of reach of cats, dogs and children.
Set your pot size, light and humidity — the calculator tunes the watering rhythm to your home.
Light at the spot
Humidity
Season
Water Molten Lava Oxalis
every 6 days
≈ about weekly · 5× per month
Let the top 2–3 cm dry and finger-check before watering again.
Molten Lava Oxalis prefers bright, indirect but will cope with medium to bright. Harsh midday sun can scorch sensitive leaves, while too little light leads to leggy, sparse growth.
Keep Molten Lava Oxalis between 14–25 °C and aim for around 45% humidity (35% minimum). Below 7 °C it risks cold damage — keep it away from draughty windows and radiators.
14–25 °C
Not below 7 °C
45%
35% minimum
Let the top dry out
Soil between waterings
Pot Molten Lava Oxalis in free-draining, loam-based mix. A drainage hole is essential — soggy, airless soil is the single most common way houseplants die.
False shamrock contains soluble oxalates that can upset pets and people if eaten in quantity; small nibbles rarely cause more than mild stomach upset.
The best ways to propagate Molten Lava Oxalis are division and bulbs. Late spring and summer are ideal, when the plant is growing most actively.
The purple shamrock folds its triangular leaves closed at night and reopens them at dawn; if it dies back, it is just dormant — rest the bulbs and they return.
In the growing season Molten Lava Oxalis needs watering about weekly (about every 6 days in a 16 cm pot at medium light), and much less in winter — roughly every 14 days. Use the watering calculator above to get the exact interval for your conditions.
Molten Lava Oxalis thrives in bright, indirect. A spot near a bright window out of harsh midday sun is ideal; give it a little more light in winter.
Molten Lava Oxalis is mildly toxic to pets. False shamrock contains soluble oxalates that can upset pets and people if eaten in quantity; small nibbles rarely cause more than mild stomach upset.
The most common problem with Molten Lava Oxalis is winter dormancy. Check your watering and drainage first — most issues trace back to too much or too little water.
The best ways to propagate Molten Lava Oxalis are division and bulbs. Late spring and summer are ideal, when the plant is growing most actively.
Indoors Molten Lava Oxalis typically reaches 15–30 cm. With the right light and occasional repotting it stays compact and bushy.
Care data last verified on 15 June 2026.
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