Chickens start eating greens [help]

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The lock of my little chicks cage came loose (possibly left open by accident). Some of my small chicks must've kicked their door open.

They all appear to be alive. I think I found them before the big chickens did.

However, they got into some salad and other vegetables I had for the big chickens. They also could have gotten into some of the weeds in our yard rn.
I'm unaware of the weeds being poisonous to the older chickens. The previous owners stated they have been giving it to them for years.

How worried should I be?

 

[Naser]

Don't worry they will not eat poisonous plants, you can't either they taste awful, I had one week old chicks out eating grass with all kind of weeds around them.