Reading all the comments in this thread has been very interesting. I would like to add my thoughts.
It is important to make sure the seeds purchased will work in your zone. Here I need “heat tolerant” seeds for veggies/tomatoes/etc. Herbs don't seem to be affected.
Any days with a temp over 86 deg is a "heat day" & we have plenty of them here. I don't buy F/M seeds for that reason but the Blue Lake Bush Beans did do well but were not in full sun all day. They got a lot of shade but it is still hot outside.
On the problem of lots of squash flowers but no fruit could very well be a pollination problem as bees are in short supply. The flowers can be hand pollinated with a Q-tip as both male/female are on the same plant. The female stem has a little bulge under the flower; male does not.
Seeds of change also sells “heat tolerant” seeds and I have a list that was given to me which I will gladly pass on to those of interest.
My email: firstname.lastname@example.org
Please put “need heat tolerant seed info from seeds of change” in the subject line so I will know what it is about & won't delete the email.
To get more bees/butterflies in your yards it is a great idea to plant flowers that attract them. Butterflies will pollinate but not to the same degree as bees. I only purchase flowers that are attractive to bees & butterflies for this reason.
I hope this information will be of a help to you all.