I suspect they died from overwatering. I suggest starting over with new plants. Water them when you plant them, and then wait until they dry out a bit before giving them a good soaking. Plants like less-frequent, deep watering. Also, pay attention to the weather and the moisture level of the soil. Some weeks you will water more, others less. Air temperature and rainfall really determine how much water your plants need from week to week.
Hi Donna,
I suspect they died from overwatering. I suggest starting over with new plants. Water them when you plant them, and then wait until they dry out a bit before giving them a good soaking. Plants like less-frequent, deep watering. Also, pay attention to the weather and the moisture level of the soil. Some weeks you will water more, others less. Air temperature and rainfall really determine how much water your plants need from week to week.