How can I tell if my copper fungicide is still effective?
I've got a stash of copper fungicide in my garden shed, and I’m wondering about its efficacy! I live in Cape Town, and while I’ve kept it in a cool, dry place, it's been sitting there for a while now. I’ve used it on my tomatoes and other plants in the past but am unsure if it can lose potency over time. Is there a way to test its effectiveness, or should I just invest in a new bottle? What are the signs that it’s time to replace it? I want to ensure I’m using the best possible products for my plants! 🌼💧