'Korean Rock' Fern

Discover the quiet elegance of the Korean Rock Fern — a compact, lush fern that thrives where other plants struggle. Polystichum tsus-simense, known as the Korean Rock Fern or Tsus-sima Holly Fern, is a refined, slow-growing fern with deeply lobed, glossy fronds that bring a touch of the East Asian forest floor into your home. Unlike fussier ferns, this one is remarkably tolerant of low humidity and lower light, making it an ideal choice for apartments, offices, and shaded rooms.

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🌿 Why Plant Lovers Choose the Korean Rock Fern

• Low-Light Champion — One of the most shade-tolerant ferns available, perfect for north-facing windows or dim corners.
• Humidity Tolerant — More forgiving than tropical ferns; doesn't require constant misting or a humidifier.
• Compact & Elegant — Stays a manageable size, ideal for desks, shelves, and terrariums.
• Evergreen Foliage — Maintains its glossy, dark green fronds year-round.
• Pet-Friendly — Non-toxic to cats and dogs.

🌱 Plant Profile

• Botanical Name: Polystichum tsus-simense
• Common Names: Korean Rock Fern, Tsus-sima Holly Fern
• Family: Dryopteridaceae
• Origin: East Asia (China, Japan, Korea)
• Mature Size: 12–18" tall and wide
• Growth Rate: Slow to moderate

☀️ Care at a Glance

• Light: Low to medium indirect light. Avoid direct sun.
• Water: Keep soil consistently moist but not soggy. Water when the top half-inch feels dry.
• Humidity: Average household humidity is fine; higher humidity encourages lusher growth.
• Soil: Rich, well-draining potting mix with added peat or compost.
• Temperature: 60–75°F. Tolerates cooler temps better than most houseplants.
• Fertilizer: Light feeding with a balanced liquid fertilizer once a month in spring and summer.

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