Fern Bird's Nest Asplenium musifolium 'Cobra'Also sold as Asplenium nidus 'Cobra'. If you love Birds Nest Ferns then this unique fern is sure to dazzle you! Its glossy green fronds are super rigid and highly ribbed, just requiring the same easy care as the more common Birds Nest varieties. General Fern Care Tips: Light: These plants enjoy bright, indirect light. Water: This plant does not like to dry out, so water it often but make sure the soil does not become soggy either