Why do calatheas get brown tips?

This plant gets adequate water, but the tips are brown and the edges look bad, and it does not seem to be putting out new leaves. It is in the shade on a porch.
Thank you!

Hi Angela,

Your plant is a type of Calathea.  Calatheas get brown tips when there is not enough humidity in the air around them. There are several ways to increase the humidity around a plant. You can place your calathea on a wet pebble tray, but be sure the plant is sitting on pebbles and not in the water; place a small humidifier near the plant; or try grouping your plants to create a mini- greenhouse effect.