While oleanders are toxic so are a number of other plants such as Sago palms. It is reported that there are hundreds of oleanders growing in the backyards of SCA already. Animals don’t eat the leaves as they are very bitter. Thus where you see oleander growing you do not find dead animals. If you have a concern for you grandchildren or pets then you can make your own choice to not plant it. This is the thinking behind this change. It is trying to ban as few plants as possible as what cannot be seen from the street often escapes compliance enforcement.