Plants for Play Database
I am a landscape architect, I know plant, I love plants. But, I am always a little nervous about using the right plant in playscapes. That is why I like this tool so much. You can search by state, region, zone, plant type, etc.
I do not rely completely on this list. I check Oregon poison control and a few of my other favorite poisonous plant databases and here before I finalize my planting plan. But, this is a fun list and great if you need a few suggestions.