I have three broccoli plants in a large container and something is eating it even though it's under net. I sprayed them thoroughly this morning, including under the leaves, with organic Garden Safe Fungicide 3, which is mainly Neem oil. It says,
1. “Fungicide: controls black spot, rust, and powdery mildew.”
2. “Insecticide: controls aphids, whiteflies, and other listed insect pests.” (many listed but print is light green and too small to read well)
3, Miticide: controls spider mites
I don't know much about safe “poisons” for plants but I do know Neem oil is okay.