How to Fertilize Ornithidium densum?
Balanced perennial feed every four weeks from spring through summer

Ornithidium densum · Ornithidium densum
Grow in an open, free-draining, medium-grade, bark-based orchid mix with addition of perlite, sphagnum moss or coir. Requires day temperatures around 18-20°C and 14-16°C at night. Provide good light levels, but avoid direct sunlight. Water plants thoroughly when compost is almost dry, allow to drain and use orchid fertiliser regularly during growing season. See also indoor orchid cultivation
Balanced perennial feed every four weeks from spring through summer