When geranium leaves yellow, it’s a sign that the plant is suffering from nutrient deficiencies or environmental stress. Generally, a balanced feeding regimen will remedy the problem. Aside from a lack of nutrients, cold temperatures or overwatering can also cause a geranium’s foliage to turn yellow.

Overwatering a geranium is the most common reason that its leaves turn yellow. This is especially true if the geranium is growing in a small container and receives excessive amounts of water for its size. When this happens, the soil becomes waterlogged and loses its aeration. A lack of aeration leads to soil compaction and a deficiency in nutrients.

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A bacterial disease like pelargonium leaf rot or blight is another cause of geranium leaves turning yellow. This disease starts at the bottom of a geranium and eventually spreads to the rest of the plant. This is a serious disease that will eventually kill your geranium.

Other causes of geranium leaves turning yellow include too much sun or heat, over-fertilization and cool temperatures. If a geranium is getting too much sun, move it to a shadier location during the hottest part of the day. If your geranium is overfertilized, reduce the amount of fertilizer used or switch to a slow-release formula that is less salty. If your geraniums are experiencing cool temperatures, cover them with bubble wrap or bring them inside to protect them. If a pest or disease infestation is to blame, this will typically show up as spots or holes in the leaves.