Find a vase that fits inside another vase with half an inch of room between them. Fill the space between the two vases up most of the way with water before slipping in sliced lemons (the arrangement pictured required nine lemons).
199 Poisonous Plants To Watch Out For If You Have Dogs, Cats, or Kids
We love to decorate our homes with plants, but we're rarely aware of the plants--and plant parts--that could be poisonous to pets and children.: 199 Poisonous Plants to Keep Away from Humans, Dogs & Cats