Your average home seller isn't a Botanist. And your average seller plants and cares for many plants and shrubs they know very little about. Throughout the Houston area we have an abundance of Oleanders. These shrubs are widely popular because of their extreme durability, price and overall appearance.
When consumed by mammals, especially dogs, oleanders can kill. But so can many other types of plants. A friend of mine who owns a landscaping company told me that many of the plants in your average garden are considered toxic. One lady reportedly died from attempting to make oleander tea as a last ditch effort to cure her cancer. Another man died from eating mass quantities of it because he read that it was a natural plant that could cure his stomach cancer.
Should a seller disclose anything they know about the dangers of their plants?
If I were an attorney, and I'm not, I'd say yes. You should disclose anything relevant to the property that might expose you for claim. Best to over disclose and get a signature...then be forced to explain later.
Or maybe that's being extreme. It's not like homeowners disclose that the batteries in the upstairs smoke detector are old, cheap and likely to stop working. I suspect there will be comments from readers on this post that will suggest a buyer with pets should have the responsibility to decide if plants are harmful to their pet or not. A seller shouldn't be responsible to understand, learn or know the danger levels of every plant or chemical used in their lawn. Lets not even talk about the organisms in the pool or type of fertilizer tossed out back. Damn those electromagnetic fields from the power lines! RUN FOR YOUR LIVES!
Today you're the Jury!
The Plaintiff (buyer) is suing the homeowner for 10 trillion dollars because the buyers salivating Rott ate some oleander as a side salad with the neighbors pussy cat & died. Hey don't laugh, this is America.