I'm sorry but epsom salts is magnesium sulfate, not calcium, and while
it could perhaps provide some benefit if the plant shows symptoms of
magnesium deficiency it offers no benefits against blossom end rot.

Dave

Epsom salts can make BER worse.

That video doesn't address the well-documented phenomenon of Mg and Ca antagonism. Also, Mg sulfate isn't a macronutrient.

Gary Pilarchek has some nice videos, but there's a lot of folklore in his content, and much of it is incorrect.

Too much Ca causes Mg deficiency in the plant. Too much Mg causes Ca deficiency in the plant. BER is due to inadequate presence of Ca in the developing fruit. Too much Mg can contribute to this problem.

While your garden conditions may benefit from extra Mg or be balanced enough that some extra Mg doesn't cause a problem, it's irresponsible to advise everyone, without knowing their soil situation or whether or not their plants are actually experiencing deficiencies, to apply epsom salts to their tomatoes. They could end up exacerbating a problem with poor calcium uptake and create a deficiency.

To address your edited post: if your plants are having problems with "turgor pressure", i.e., they're wilting or they have oedema, there is either something wrong with their roots/circulatory system, such as a disease or damage, or the weather conditions are causing problems with either excessive or inadequate transpiration. In neither case will epsom salts fix the problem.

If you can point to where any "personal attack" at all has been made on you, then I will gladly apologize. But pointing out someone's incorrect information and disagreeing with their claims is not a personal attack. For more science-based information on epsom salt in gardening, I recommend everyone read this before applying it to their soil on the recommendations and claims of random people on the Internet.
https://s3.wp.wsu.edu/uploads/sites/403/2015/03/epsom-salts.pdf

We all need to look at gardening folklore with a skeptical eye. Lots of practices that are "conventional wisdom" online have no basis in fact and can at best be a waste of money and effort and at worst actively harm our plants or soil.

Personal attack? I guess some posts have been removed as there is now a big discontinuity in the discussion. I think there was one here recommending the use of Epsom Salts at one time.

Dave

Yes, posts have been deleted. Mine are still there and not edited since I posted them. So if you can point out where I personally attacked her, please let me know, and I'll refrain from the behavior in future.

Don't see any issues gb. Your comments are quite accurate. As we both know epsom salts often gets touted - inaccurately so - as a cure all with little regard for the problems indiscriminate use of it can create.

Dave

Hi there! I’m in Virginia, outside of DC, and we get very hot and humid here as well. Last year was my first growing San Marzano, and it was very happy. We had a late fall—it was in the 90s into October!—and SM kept producing while some of the others threw in the towel. I did have some issues with BER but I attribute that to insufficient watering while out of town for vacation and a conference I went to; I don’t have an irrigation system and nobody will take care of your babies like you will. ;)

FWIW, if I catch BER early, I pick the tomato, cut off the end, and collect in a freezer bag to make salsa verde in the fall. :)

And! Sorry! No cracking. Despite torrential DC thunderstorms. But see insufficient watering as above.