Geo is a plant native to tropical rainforests where it doesn’t dry out. If its soil gets too dry, Geo wilts. If it gets too dry, the leaf edges will turn brown/crispy when it recovers after watering. Drafts can also cause leaves to turn brown, especially cold air, such as being next to an air conditioning vent. Too much fertilizer will damage its roots, preventing the plant from absorbing as much moisture as it needs. This can also lead to browning leaves.