Nothing at all is present in the pen itself now, not a blade or leaf of green to be seen, and I now regularly check and pluck out ANYTHING green, just in case. Hemlock kills through respiratory paralysis, a terrible, terrible way to see an animal die

I shall never forgive myself for killing my beautiful bunny boy with ignorance....
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We also obliterate all weeds that grow within about three feet of the pen but there is still the chance of self-seeding, hence why I would prefer to keep the suppressant as long as it is not a threat in itself.