| Description | Thick Stemmed Wood Fern (Dryopteris crassirhizom) is a vase-shaped fern reaching around 3 feet tall. Stem is formed from a thick, stout, erect rhizome. Makes a good single specimen plant or planted in groups. |
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| Pronunciation | (dry-OP-ter-iss)(krass-eer-iz-OH-mah) |
| Plant Type | Perennials Hardy, Ferns - Hardy |
| Hardiness Zone | 4-9 |
| Sunlight | light shade, shade, dappled shade |
| Moisture | average |
| Soil & Site | average, woodsy, humusy |
| Temperature | Reported to be a little sensitive to frosts. |
| Flowers | non-flowering |
| Fruit | spores |
| Leaves | Fronds are pinnate, pinnatifid, with over 30 pairs of closely spaced pinnae with very short stipes. The pinnae have a crenate margin. The fronds are the widest at the center. |
| Stems | The crown is made from an up to four-inch thick erect rhizome. |
| Dimensions | +3 feet tall, vase-shaped from a central crown |
| Maintenance | Remove dead fronds in the fall or before new growth in the spring. |
| Propagation | spores |
| Native Site | Endemic to Northeast Asia |
| Misc Facts | The genus name Dryopteris (Greek) means "oak-fern." Species name from the Latin 'Crassus' (thick) and the Greek 'rhizoma' (mass of roots) |
| Notes & Reference | #80-A Field Guide to Ferns (Boughton Cobb), #90-Ferns for American Gardens (John T Mickel) |
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