Q.have 2 Euonymas out of 13 that have started dropping their leaves at the bottom.
We have 2 Euonymas out of 13 that have started dropping their leaves at the bottom. see photo Could it be the heat and they dried out? Have looked for bugs but don’t see anything on leaves etc. All plants have been watered the same, so not sure whey these two have a problem.

It could be that these two are using nutrients slightly faster and using them up before the rest of them. Slow release fertilizers can help. This article will help: https://www.gardeningknowhow.com/ornamental/shrubs/golden-euonymus/golden-euonymus-care.htm