24+ Fern Leaves Turning Brown. If you let those old leaves float in the tank a while though, they will probably produce new plantlets that are already acclimated to your tank. Oh my goodness…it's infuriating and sad at the same time.
While the other in direct sunlight went brown and dried. The leaves also have brown spots. If you are not thoroughly soaking your soil when you water, the presence of dry soil pockets in your pot will be problematic.
When you water, remove the plant from lower leaves getting black edges and eventually turning yellow.
Why would boston fern leaves turn black (houseplants, ferns gardening, horticulture)? The plant is otherwise healthy, and is actively growing. When dealing with sunburn, the fronds that are. Ferns are lush, green woodland plants valued for their ability to thrive in low light the boston fern plant requires plenty of humidity and low light to prevent the fern from turning brown.