I think quite a few of you use Kmag for your crotons. The one I get from my nursery is a Florikan product which is 0-0-20 Florikote SPM. It has the Potassium Sulfate instead of Nitrate, so that it imparts a bit of acidity to the soil. On asking, I found out it has only 45 days of slow release to it. It is very expensive- around $67 per 50 lb. bag. I use about a half cup to a plant since most of my plants are under 2 feet without a lot of foliage. I can't help but think you all have a better alternative. I looked up online and you can get things like Sul-Po Mag for less than half the price- but my supplier tells me they are not slow release. What do you all use and what do you think you get out of it? Thanks and sorry for so many questions.