Also known as Oak Fern · Pacific Oak-Fern · Pacific Oakfern
Pacific oak fern (Gymnocarpium disjunctum) is a delicate, deciduous fern native to western North America, thriving in moist, shaded woodlands.
At-a-glance light, water, soil, and growing conditions from plant data
Partial to full shade
25% intensity
Prefers shady conditions. Protect from direct sunlight, which can scorch fronds.
Consistent moisture
75% intensity
Keep soil consistently moist but not waterlogged.
Humus-rich, well-drained soil
50% intensity
Cool to moderate
50% intensity
Prefers temperatures between 15-24°C during the day and slightly cooler at night. Avoid extreme heat.
Low feeding
25% intensity
Feed lightly with a balanced liquid fertilizer diluted to half strength during the growing season.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
| Edible | No |
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Maintain consistently moist soil, avoiding waterlogged conditions. Water thoroughly when the top few centimeters of soil begin to feel dry.
Reduce watering slightly during winter dormancy, but never allow the plant to dry out completely. Good drainage is crucial.
Prune to remove any dead, damaged, or browning fronds. This can be done at any time of year. Minimal pruning is generally required, as the fern naturally forms a neat clump. The goal is to maintain health and appearance.
Divide established clumps in spring or early autumn. Carefully separate the rhizomes, ensuring each division has some roots and at least one growing point. Replant immediately in moist, well-draining soil.
Alternatively, spores can be collected and sown, but this is a slower process.
Repot every 2-3 years, or when the plant becomes root-bound. Use a slightly larger pot with a well-draining, peat-based potting mix. Repot in spring before new growth begins.
Ensure the rhizome is at or slightly below the soil surface.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Pacific Oak Fern (Gymnocarpium disjunctum)
Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Polypodiopsida |
| Order | Polypodiales |
| Family | Cystopteridaceae |
| Genus | Gymnocarpium |
| Species | Gymnocarpium disjunctum |
Similar in genus Gymnocarpium
Answers based on plant encyclopedia data
