If your monstera looks healthy but all of the sudden the leaves are curling in, its trying to tell you something! , The first thing I would check is the soil! , Most common cause of curling leaves is Variegated Calamondin Tree Georgia Grown Citrus Ligustrum vulgare, Gemeiner Liguster Semper Verde Pflanzenzentrum Ullmer GbR When to Plant Amaryllis Bulbs for Blooms by Christmas