Q.is epsom salt good for snapdragons
I just want to know if Epsom salt is good for snapdragon plants.

I use some Epsom Salts on our Snap Dragons once a year and they seem to have sturdier main stems due to its use. Some gardeners say to have your soils tested first, as some soils are already high in magnesium and adding the Epsom Salts may not really be needed. No need adding something if it is already there in abundance and adding to possible soils salts issues. Here is an article for you to check out on the use of Epsom Salts: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/epsom-salt-gardening.htm
Here is an article for you as well on Snap Dragon growing and care: https://www.gardeningknowhow.com/ornamental/flowers/snapdragon/growing-snapdragon.htm
Enjoy those talking blooms! :-)