Weed killing / wildflower questions

If I were to use a weed killer on my lawn and add some of the then mowed
lawn to a compost pile, would that be bad for the compost being made.
For example, would the compost then kill any plants that I used it to
mulch on their bed?
 So far I have been pulling weeds, but they are fast getting the best of
me.
 Also, another question altogether...I live near a woods and there are a
lot of wild trillium and mayapple plants in there. Are these perennials,
and would I even want them in my garden?
 I read where the mayapple parts are poisonous, so I suppose they would
have to be used away from where the dogs could get to them?
 Rita

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