Sure thing! I started this treatment on Fruit trees potted a few years ago to break the Cedar rust cycle and the results were impressive so I have since tried it on a LARGE variety of plants with no ill effect and have only seen fungal issues on new plants which I isolate and treat normally with Daconil and Sulfur - it works.
Once fungal free I have simply been using the Sulfur as a preventative. I mix two tablespoons in a one gallon container of water and shake it a few times to mix. I then water the plants one time in Spring, Summer, and Fall. Crystal can verify the results are great and has me doing the same with her garden Flora...
If you get it on a trunk or branch simply rinse it off with water so it does not whiten. I also use it like a paste when removing moss from trunks and such but that is a different topic. Point is Sulfur is inexpensive, natural, and has a few uses.
This is the powder I use but any brand powder that is labeled 90 percent Sulfur works fine. This one is available at a lot of places and usually costs 8.99 - 9.99USD for the one pound container which goes a LONG way. I know of no place it is restricted from use as it is harmless -
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Grimmy