Never use Black Cow bags. Some of it will contain weed killer and its ruined so much of my time and lots of friends I know. I just discovered my problem and have talked to lots of friends with same problem that has no idea they were poisoning their gardens.

Most hay, straw and manure has aminopyralid in it. Aka Grazon. I can't believe Black Cow is sold.

If your plant leaves curl upward.
Short plants
Tomatoe plants look good and bloom but won't produce lots of tomatoes.
Look for the leave curl. It won't kill the plants.