I got some sort of powder stuff on my corn salad, I am not sure what to do now.

[Nick Blair]

Is the plant okay to eat still? It is not growing but is still green and alive. Can this powder stuff infect other plants, I am thinking of growing land cress to replace it. I have been growing it in a trough.

[Jeanied]

It sounds like you have powdery mildew, Nick. In which case, I would throw the stuff away and not eat it.

[Nick Blair]

Can it hurt humans? I have been sick recently , and so maybe thats why.

Should it be okay to grow vegetables in the same soil? Should I throw the soil away or use it again?

[taff]

if you're only going to grow stuff in it that doesnt need much in the way of nutrients, like lettuce etc, use the same soil again.
Powdery mildew is a fungus, usually affecting things like squash/courgette leaves etc, it can infect nearly anything, so don't eat any more fuzzy white leaves

[Two_Sheds]

I don't think powdery mildew can infect humans Nick. Your sickness is probably the same bug that we've got going round our school.

Powdery mildew occurs when the roots are getting less water than the leaves are transpiring, ie under-watering.

[Nick Blair]

They were getting plenty of water. I have destroyed them anyway.