A number of things could be killing your plants. Some common problems include watering them from the top/overhead. This, and/or a lot of rain, can lead to white mold fungus. Water lightly at ground level. Planting them in dirty, or infected, pots/containers. Root rot can be a problem. Spider mites can devastate plants in hot, dry weather. Every year is an experiment. Keep trying.
A number of things could be killing your plants. Some common problems include watering them from the top/overhead. This, and/or a lot of rain, can lead to white mold fungus. Water lightly at ground level. Planting them in dirty, or infected, pots/containers. Root rot can be a problem. Spider mites can devastate plants in hot, dry weather. Every year is an experiment. Keep trying.