Hi gettingthere, ask your question without worrying. If it is asked in the wrong forum someone will just come along and move it to the correct forum.
Of course you are allowed-I think LOL Of cours you are allowed, as far as I know. It is hard I know to find the right category for your question though, and that I can understand. By the way, what is your question about exterior design? About furniture or the garden layout (plants, and other living things or non-living things??)