i'm not really sure.
i have not, but plan too.
heres the link to the product
Looks like cattle block. It's about 2% down on carbs vs table, and half of that is Potassium. So just 1% unaccounted for but we know it's Iron and Calcium plus some others that are quite field dependent. Presuming it's cattle block. The winter cow lollipop they often tie to a gate.
A bit of reading shows its a common school science project to feed plants table sugar. A couple of teaspoons in a liter may do a lot of good or may harm a plant. This seems to work in soil-less grows where plants are not doing their best at making their own sugars. Which would indicate it's not only the microlife that like a bit of sugar. Though I have often read plants can't use it at the root, from higher learning sources.
Really need to look at them science fair projects and their pics as evidence. I'm out the door though... Things to do