How to Fertilize scaly male fern?
Very dilute fern feed monthly during warm active frond growth

scaly male fern · Dryopteris affinis
Also known as: golden shield fern
Easy to grow in most cool, moist, lightly shaded sites and will grow in full sun if given plenty of moisture. Tolerant of dry shade but water regularly in their first season and mulch well
Very dilute fern feed monthly during warm active frond growth