I came home today and noticed that several of my Scaly Tree Fern's fronds were shriveled up. I have only had it about a month. It was growing in a container and positioned under a tree in my back yard so it was receiving only filtered sun light (moved it to the front porch today to provide additional sun protection, in case that was the issue). The soil is moist - we have had frequent afternoon downpours recently so I haven't needed to water. The temperature was warm today (88 degrees) but has been has been warmer this year and didn't seem to effect it. What am I doing or not doing to cause this?