Prefer warm and humid climates. The deep green leaves will naturally darken as the plant matures, and though red stem development can be caused by heat/light stress with some species. Ps20145-button-fern-care-guide Ferns Care Button Fern Ferns Button fern care (complete guide) if you’re up for a tropical vibe for your home, button ferns must be on your list. Button fern care guide . Ferns prefer lots of humidity and temperatures around 70 °f, so try to keep the temperature and humidity levels consistent if you're growing your plants indoors. Your plant (picture #1) looks like a button fern (pellaea rotundifolia’) (picture #2). Bright indirect light to part shade at most is best for these plants. However, one could argue that the humidity level is much more important to these plants than the specific temperature. Bright indirect light very few houseplants should be placed in direct sun. Lemon button ferns prefer warmer temperatures. Needs a little extra care. B...