How do I count objects in a layout document?

I create landscape design documents where hundreds of plants are placed in my document. I have to count how many of each plant are in the document. How can I do this without having to hand count each plant?

It seems like there should be a feature where Layout can give you a count of identical objects in the document.

I don’t think there is any facility for that in LayOut. If your plants are components in your SketchUp model, they could be counted there and a report generated to show that.