Is Japanese knotweed poisonous to guniea pig and rabbits?

I have 2 guinea pigs and a rabbit, who are currently living inside, we are going to put them outside when it gets warm and there is a very large space at the bottom of the garden but has a lot of Japanese knotweed in it I was wondering if it would harm the small furries, I've looked online but can't find a... show more I have 2 guinea pigs and a rabbit, who are currently living inside, we are going to put them outside when it gets warm and there is a very large space at the bottom of the garden but has a lot of Japanese knotweed in it I was wondering if it would harm the small furries, I've looked online but can't find a definite awnser
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