I planted my chard from plants I bought. They were doing well. I watered them daily, but the last few days have been very hot. The leaves dried up during the hot spell. Was this from the heat or the soil? The plants were in my garden for 2 weeks.
Excessive heat and wind can cause the leaves to dry up.
Your plants are quite new to the garden space and may not have taken root enough yet.
Continue to water the plants and you can even try to shield them from the hottest part of the day.