Answer: The young foliage on a Swiss Cheese plant is normally undivided but will develop the characteristic splits and holes as the leaves mature. If the foliage is young, you just need to be a little more patient. If the foliage is mature, the most likely causes are lack of light, cold air, too little water and underfeeding. In tall plants the most likely reason is failure of water and food to reach the uppermost leaves. So, if the leaves are young, be a little more patient with your plant and it will grow into a lovely specimen. If it's the older foliage that's affected, move your plant to a brighter location and water more diligently. Feed every 3-4 weeks with a half-strength dilution of liquid fertilizer to provide the necessary nutrients to your splitleaf philodendron and encourage the development of splits and holes in the leaves.
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