pygmy palm tree

Question

When their leaves start to dry up, what does that indicate? I water it.

Answer 1

If the leaves start drying up from the tips and edges first, see this article:
https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm

Pygmy date palms are resistant to most palm diseases, but check whether any of these disease symptoms match:
http://edis.ifas.ufl.edu/pp142