It can be pretty heartbreaking when your plants look less than stellar. Sometimes an easy remedy to restore plant health is adding more water or moving to a sunnier spot. If that doesn’t work and you’ve tried many options, it could be a sign of a larger problem. Your plant could have a disease. To help you quickly diagnose and keep your plants looking fresh, we’ve compiled a handy guide below of most common plant diseases you can encounter. So the next time you see a weird substance forming on the soil or strange discoloration of leaves, you’ll be an expert.  What About Fungicide? Fungicide can be a useful preventative measure for gardeners with plants that are especially prone to rot and disease. If you’re concerned about adding chemicals to your garden, depending on the condition and the disease, there are some natural alternatives: Milk is known as an effective treatment for powdery mildew. Mix a 50:50 milk to water solution in a spray bottle and apply to leaves of plants. Sulfu...