Question
Hello, Sir,
Thank you for your advice. As a followup question/comment to your reply regarding the moss/fungus, I would like to add the following information:
All the lava rock sits on top of a breathable plastic weed retardant cover between the lava rock and the earth.  The water is supposed to be able to drain through the plastic, and I believe it does.
Secondly, all sides of the house receive approximate equal sunlight.  The worst area is the front of the house which faces the west and receives the evening setting sun.  The shrubs are well manicured and overgrowing, out-of-control shrubs should not be the problem.
Finally, I've tried other Bayer products, i.e. a spray for lawn weed control, and I wasn't impressed with the results.  (Scotts products are, in my opinion, by far the best for general, overall lawn care!)
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Followup To

Question -
Hello,
I stumbled across your website and am going to take you up on your offer of asking two gardening questions.
1. I have what I believe to be moss or a fungus growing on my lava rock which surrounds my shrubs located around my house.  Please tell me how to get rid of the moss without jeopardizing the evergreens.  The shrubs are mostly arboviatae, junipers, and yews.  I'd like to be able to spray something on the moss to kill it without harming the surrounding shrubs, and restore the beauty of the lava rock.  I also have one or two very small areas (approx. 3-4 square feet each) of my lawn where moss is also growing.
2. Most of my Wichita Junipers are slowly dying, becoming brown in certain areas of the shrub and the condition slowly spreading to additional areas of the shrub.  What is causing this?
I live near Pittsburgh, Pa.
Thanks for reading my request. I would be happy to receive your reply and solution.
Sincerely,
Howard Bauer

Answer -
1. Moss grow where there is consistent moisture. You can spray a moss and algae killer (for example "Bayer Advanced 2-in-1 Moss and Algae Killer") available at garden centers. You can also try to prune trees so the sun will reach the stones and dry them every day.

2. I am sorry, but I am not a conifer expert and believe there are probably more knowledgable persons capable of answering that question.

Answer
Moss require uniform moisture to establish and grow. If the areas where moss grow are allowed to dry out, moss will disappear on its own.

If the sun energy is not enough to dry out the stones, you can use a spray product for moss. The brand name is not important and you can go with your preferred brand.