The Common Mistake That’s Sure To Kill Your Pansies (& What To Do Instead)
Pansies thrive in moist and cool soil. When they’re grown in the landscape, pansies generally require about 1 inch of water per week, either from rain or other types of irrigation. Plants grown in containers or hanging baskets usually need to be watered more often. Water your plants when the soil 1 inch below the surface has dried out. Be sure to water thoroughly, particularly if you are trying to rehydrate very dry potting mix.
While pansies grow best in moist soil, they are also prone to root diseases including black root rot (Thielaviopsis basicola), so it is essential not to overwater them or allow them to sit in waterlogged soil. If you are growing pansies in containers, be sure the pots have enough drainage holes to allow water to flow freely. Signs of root rot include wilting, yellowing leaves, and eventually death. Because most diseases that cause root rot are contagious and soil-borne, consider relocating any plants sharing a container with a plant with root rot.