I just hope the water in the plastic container won't get hot during scorching days.

Yes. We had this. We came to check the plants. Under one bush, the water did not flow and remained in the bottle. The bottle was clogged. The water was hot. We punctured the bottle again and filled it with fresh water.

And look at those beautiful flowers! They seem to enjoy the sunshine.

Thank you. These are June flowers. They bloom only in early summer.

The yellow ones are Eschscholzia; they will bloom until October. They are sun-resistant.