IN LEED for homes SS2.5 and WE2.3 can I get all points if I have no irrigation

I have a landscape design which includes undisturbed drought tolerant shrubs that were on the site before I started building and the grass that I put in is drought tolerant short red fescue. I am not installing an irrigation system. Shouldn’t I automatically get 10 pts for this?
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This has been a question we have asked as well. It appears that you cannot get all of the points for having no irrigation system. I don't understand the rationale, but essentially they are rewarding you for having a well designed irrigation system over no system at all....That was the experience on our most recent project....