Spots, blotches, or blemishes on the leaves of your plant come from a variety of sources. Intense light causes sunburn on your plant, causing the leaves to blister. Make sure you know what level of sunlight your plant requires to avoid over exposure. Temperatures below 50 degrees F also cause spotting on your plant. Spray from chemicals and over watering are also causes for spots and blemishes. Keeping your plant on a strict watering schedule is an easy way to avoid that problem.
Rhapis excelsa loves moist well-drained soil, so water generously. Avoid over watering. Over watering any plant that can cause root rot. The Lady Palm can thrive in shade as well as full solar exposure. Tip burning can occur in full direct sun while the plant is in the process of acclimating. For best leaf color and optimum growth, grow in full yet indirect light. In shade the leaves will darken.
Water new plantings more often. Young plants often require more moisture at the soil surface to help their roots get established.
Over watering is a common problem with interior plants - when in doubt do not water!