By Jack E. Christensen Posted: 03/05/2011 01:00:00 AM PST Now is a good time to fertilize rosebushes with Epsom salts. (Photo by Wang Kun Hung, reproduced under the Creative Commons Attribution 2.0 Generic License) 1 Apply a quarter cup of Epsom salts (magnesium sulfate) to each mature rose bush to boost both vigor and flowering capacity. It is inexpensive and can be found at drug stores, where it is commonly sold as a laxative or for soaking feet. A cup or so spread around citrus,...
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