I have been gardening in this space for 12 years. This is the first time I have had this problem. The first planting did a little better than the second planting. The only thing I did difference is I use some Organic cow manure compost. After starting all over by retilling the soil and replanting I am still getting the same result. I break off all the leaves that have start to brown and two days later they are turning again. Please Help