Maidenhair Fern New Growth . If placed in direct sun ensure that humidity and soil moisture is maintained. On the adiantum raddianum, the older foliage is dry and droopy, and the ends of the fronds are very brown. Maidenhair Fern Care Not That Delicate House Plant Journal from www.houseplantjournal.com In order to propagate your maidenhair, pull it out of the soil while being careful to leave the roots intact. The most common cause of failure for maidenhair ferns is low humidity. Amend your garden soil, if needed, with compost and organic matter.