Thanks, Joanna! You got here before I did! I just buy it in bags at Wal-Mart (it is in the pharmacy area). I typically put 1/4 c. in the bottom of a gallon watering can, add a few inches of very warm water, and stir to dissolve. Then I fill the can the rest of the way from my rain barrels, and use it to water my clematis, roses, and tomatoes! If I'm doing a lot of watering, I'll mix up a bigger batch of the dissolved Epsom salts Just guess-timating, but I probably dissolve a couple of cups of Epsom salts in a gallon pitcher of very warm water, and then add that concentrate to each watering can before filling it with rain water. I also give my tomatoes a handful of Epsom salts in the hole as I plant them.
