Plant Care Irish spleenwort

Irish spleenwort

About Irish spleenwort

Irish spleenwort is a super rare houseplant 🌿 that needs lots of water to thrive. They do best in abundant sunlight ☀ and should be less than 3 feet from a window.

Irish spleenwort likes soil that is good at retaining moisture. Your plant shouldn't need added fertilizers if you repot each time it doubles in size.


Asplenium onopteris

Also known as

Irish spleenwort and western black spleenwort

How to care for Irish spleenwort


How often to water your Irish spleenwort

Water needs for Irish spleenwort
0.5 cups
every 7

Irish spleenwort needs 0.5 cups of water every 7 when it doesn’t get direct sunlight and is potted in a 5" pot.

Use our water calculator to personalize watering recommendations to your environment or download Greg for more advanced recommendations for all of your plants.

Calculate water needs of Irish spleenwort

Water 0.5 cups every

Does your plant get direct sunlight?

Select the pot size


Check the growing potential in your area

A plant's growing potential is determined from its location, the time of year, and current local weather.

Select a city to check sunlight intensity

Finding light for Irish spleenwort in your home

Light needs and placement for plant Irish spleenwort: 3ft from a window
3ft or less from
a window

Irish spleenwort may have difficulty thriving, and will drop leaves 🍃, without ample sunlight.

Place it less than 3 feet from a south-facing window to maximize the potential for growth.

Select your region to see how the current weather in your area affects the placement of Irish spleenwort in your home 🏡.


How to fertilize Irish spleenwort

Nutrient, fertilizer, and repotting needs for Irish spleenwort: repot after 2X growth

Most potting soils come with ample nutrients which plants use to produce new growth.

By the time your plant has depleted the nutrients in its soil it’s likely grown enough to need a larger pot anyway.

To replenish this plant's nutrients, repot your Irish spleenwort after it doubles in size or once a year—whichever comes first.

Water Needs
Sunlight Needs

Care Summary for Irish spleenwort

Irish spleenwort

Irish spleenwort

Greg recommends:


0.5 cups every 7 days


< 3ft from a window


Repot after 2x growth

Based on the 4” pot your plant is in, and that it doesn’t get direct sunlight.

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