I don't need anything with calcium in it, since I'm watering with mostly well water that comes straight out of our limestone aquifer. Going to spray Epsom salts separately from now on, as I use it on my tomatoes, peppers and roses as well.
I was using the MSU formula for quite a while but changed over to this other Sta-Green formula just this spring as it's SO much cheaper and locally available. Didn't notice any appreciable difference - the Vandas would be the ones to show it I think, since they've been getting very dilute fert twice a week through the spring and summer. I've had good root and foliage growth and fair flowering, too.
