What Is Wrong With These Two Small Plants?

Question

Maybe due to the heat (41 degrees Celcius)?

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Answer 1

This appears to be overwatering damage. Compensation for heat should be done with shade. Watering should, only, be done when the top 2 or 3 inches of soil are completely dry.

Soils that remain saturated without a period to dry out will suffocate plant roots. Be sure to allow for a dry period, and move the plants to shade during hotter portions of the day. You may need a fungicide to take care of any infections that can arise from wet soils.

Here is an article that will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm