
Light Needs

Mature Height

Mature Spread

Feature
Korean Rock Fern is not often thought of as an indoor plant. It can be grown outdoors successfully in zones 7-10. The colder hardiness zones can grow this fern, also known as Polystichum tsus-simense, as a houseplant that spends its summer outdoors. The delicate dark-green fronds mix well with other ferns or nicely contrast a shady mixed seasonal planting. Korean Rock Fern is native to East Asia and has been naturalized in Florida and Louisiana.
Best Locations For Growing Korean Rock Fern
Ferns of all sorts enjoy high humidity and lower light levels. Rooms like the kitchen and bathroom are ideal for displaying this plant. Because Rock Fern is not considered toxic, it can be used in bedrooms and family rooms where pets and children spend time. Ferns are natural air filters and are good at filtering chemical gasses from indoor furnishings.
Korean Rock Fern Sunlight Requirements
Filtered light and low light levels are perfect for Korean Rock Fern. The dark green fronds will not tolerate exposure to direct sunlight. Place the plant in a north-facing window or east- or west-facing room away from the window.
Korean Rock Fern Care
Ferns like potting soil that is both rich and well draining. Indoor potting soil mixed in a 3:1 ratio with worm castings works well. Repot this fern in the spring when the roots grow from the bottom drainage holes. Take time to acclimate Korean Rock Fern when moving it outdoors for the summer. Gradually move it from deep shade to dappled shade. Always bring the plant indoors before the nighttime temperatures fall to 40 degrees F.
Watering Korean Rock Fern
Water this plant when the top 2-3 inches of soil feel dry. Thoroughly soak the soil and let the excess liquid drain out. Saucers should be emptied so that the roots do not sit in water. To keep the humidity high around ferns, mist the fronds daily with distilled water.
Feeding Korean Rock Fern
Slow-release granular fertilizer is an easy way to provide nutrition year-round to ferns. Mix the fertilizer into the soil at planting time or add it as a top dressing in the spring. Look for a balanced ratio of NPK at 10-10-10.
Korean Rock Fern Information
Light Exposure: Bright Indirect Light, Medium Light |
Care Requirements: Easy |
Watering Requirements: Average - Keep lightly moist. When the top 2 inches of the soil dries out. |
Pet Friendly: No |
Kid Friendly: No |
Air Purifier: Moderate |
Habit: Mounded |
Growth Rate: Fast |
Mature Height: 12-24 inches |
Mature Spread: 12-24 inches |
Flowering: No |
Flower Color(s): None |
Flower Shade/Description: Grown for Foliage |
Fragrant: No |
Foliage Type: |
Foliage Color(s): Green |
Foliage Description: Green |
Temperature: Above 60 °F (Above 16 ) |
Humidity: Above Average to High (60% - 100%) |
Common Name: Korean Rock Fern |
Other Name(s): |
Scientific Name: Polystichum tsus-simense |
Plant Type: House Plant |
- SKU:
- Fern_Korean.Rock-HP
Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on type of plant, time of year, last pruning & many other factors.

Also Known As:
Mini pot
Plant Age:
~ 2-6 months
Plant Size:
~ 2"-4"
Pot Size:
~ 1.9"H x 2"W
Volume:
~ .012-0.15 quarts

Also Known As:
Small pot
Plant Age:
~ 3-6 months
Plant Size:
~ 2"-6"
Pot Size:
~ 2.5"H x 3"W
Volume:
~ 0.3 quarts

Also Known As:
Quart pot
Plant Age:
~ 6 months
Plant Size:
~ 5"-10"
Pot Size:
~ 3.5"H x 4"W
Volume:
~ 0.75 quarts

Also Known As:
#1 Container
1 Gallon
Plant Age:
~ 6-12 months
Plant Size:
~ 8"-16"
Pot Size:
~ 5"H x 6"W
Volume:
1.5 quarts

Also Known As:
Large pot
Plant Age:
~ 1-2 years old
Plant Size:
~ 12"-24"
Pot Size:
~ 6"H x 8"W
Volume:
~ 3 quarts

Also Known As:
'
Plant Age:
~ 2-3 years
Plant Size:
~ 16"-36"
Pot Size:
~ 7.25"H x 10”W
Volume:
~ 4.5-5 quarts

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We want your plants to arrive in great condition! If you notice any issues upon delivery, contact us within 3 days.
All houseplants come with an extended 30-day warranty for added confidence. If your plant dies due to a health issue within 30 days, we’ll make it right.

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