I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
Those plants would be fine. Regarding the irrigation location either is fine. If you leave it on top of the cloth and among the rocks you can see if it is working and make any repairs such as knowing when you have clogged pores in the hose much easier. If buried it is probably better aesthetically.
Thanks for the question. Best wishes for a wonderful gardening year in 2007. Please stop in again soon!
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