Physematium obtusum
Physematium obtusum · Woodsiaceae
The gardener's calendar
Ideal time to plant physematium obtusum: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Evergreen
- Plant type
- Fern
- Adult size
- 20 to 40 cm in height
- Growth
- Slow to moderate
- Hardiness
- Hardy, tolerates cold winters
- Origin
- Temperate and mountainous regions of the northern hemisphere
- Soil type
- Well-draining, rich in organic matter
Care
Watering
Keep the soil consistently moist but not waterlogged. Water regularly during the growing season, particularly in summer. Reduce watering slightly in winter while keeping the substrate slightly moist. Ferns appreciate humid air: mist the foliage or place your plant near a humidity source.
Light Exposure
Prefer indirect, dappled light away from direct sun rays. This fern tolerates semi-shaded locations, ideal for interiors or partially shaded garden areas. Avoid very dark corners that would slow its growth.
Soil Preparation
Use a light and porous substrate made of leaf mold, peat (or ecological alternative) and sand or perlite to improve drainage. Ensure your pot has adequate drainage holes to prevent root suffocation.
Fertilization
Apply a balanced diluted fertilizer every 4 to 6 weeks during the growing season (spring-summer). Reduce fertilization in autumn and stop in winter. Excess fertilizer can damage delicate foliage; keep your applications moderate.
Pruning and Cleaning
Regularly remove yellowed or damaged fronds at the base to promote plant vigor. Clean dusty foliage with a very soft brush and warm water. No drastic pruning is necessary; ferns develop naturally.
Prevention and Common Diseases
Watch for scale insects or spider mites, favored by dry air. Increase humidity and inspect foliage regularly. Root rot can occur with excess moisture; improve substrate drainage and reduce watering if needed.
Did you know?
Ferns of the genus Physematium and the family Woodsiaceae are among the oldest forms of terrestrial life: fern fossils date back over 300 million years, long before flowers appeared. Physematium obtusum, with its delicate fronds, perpetuates this extraordinarily ancient botanical lineage and represents a living link to the Carboniferous era.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.