It will acidify soil. If your soil is already strongly acidic, I wouldn't use it.

Agree with the above but sticking to your question, no it won't hurt the vegetable garden given the time that has passed since it was applied. By now it should have degraded enough to be close to neutral pH and it will continue to decompose over the winter.

Dave

Awesome thank you everyone! I appreciate your comments!

When you asked "Will this hurt my veg garden if added to it?", I thought you were referring to ferrous sulphate. That will acidify soil big time. If you're just talking about amending your garden with grass that was treated with ferrous sulphate then, sure, who cares?

Well to make my point more clear I was reading how if you had used herbicides or other chemicals on your lawn and that ended up in your compost pile it could seriously decimate the garden next year. So I wanted to know what negative affects what I used on my lawn would cause in my garden.

Not quite sure what moss doesn't like about ferrous sulfate, and iron in particular. I guess I wouldn't call it a generic herbicide. I believe it doesn't necessarily kill the stuff even, but just burns it. As you should understand, the stuff doesn't hurt lawn grass at all. But certainly generic herbicides can remain dangerous even after composting. BTW, with regard to soil acidification, that comes from the sulfate, and not the iron.

Any idea on what the 82.5% of "other ingredients" is?

I know you didn't ask this, but what is wrong with moss? I have it growing on some of the paths that used to be grass until the bushes grew tall on either side. It doesn't need mowing and I think it looks great. Presumably, you have a big tree that is causing a lot of shade. Grass will never grow there, so a better idea might be to chose a low-growing shade-loving perennial like Ajuga which has beautiful blue flowers or to put mulch down. No more battling moss and trying to get grass to grow where it would rather not. Just a thought.......

Linda

Pretty sure this is a "moss control" fertilizer. As such, the 82.5% is probably urea and ammonium sulfate fertilizer. That is, the moss control part is just a small fraction of the weight. That's normal.

My old lady spread it when I wasn’t home. Just a couple spots in the lawn. No big deal really. Im sure it’s more due to shade and high water table. But a lot of that shade is gone now cause I’ve taken some trees down to help the garden.