Plant Care Black Tree Fern

Black Tree Fern

Also known as

Cyathea medullaris, Mamaku, Katātā, Kōrau and Pītau


Sphaeropteris medullaris

How to care for Black Tree Fern


How often to water your Black Tree Fern

Water needs for Black Tree Fern
0.5 cups
every 9

Black Tree Fern needs 0.5 cups of water every 9 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.

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 Black Tree Fern in your home

Light needs and placement for plant Black Tree Fern: 1ft from a window
1ft or less from
a window

Black Tree Fern love being close to bright, sunny windows 😎.

Place it less than 1ft from a south-facing window to maximize the potential for growth.

Black Tree Fern does not tolerate low-light 🚫.

Select your region to see how the current weather in your area affects the placement of Black Tree Fern in your home 🏡.


How to fertilize Black Tree Fern

Nutrient, fertilizer, and repotting needs for Black Tree Fern: 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 Black Tree Fern after it doubles in size or once a year—whichever comes first.

Water Needs
Sunlight Needs

Care Summary for Black Tree Fern

Black Tree Fern

Greg recommends:


0.5 cups every 9 days


< 1ft 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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