Question: What type of rock is it best to select for building rock gardens?
Answer: We'll assume you're bringing rock in from outside your property and constructing a rock garden from scratch.
Porous, softer rock is better for rock gardens than is harder rock. Harder rocks take longer to acquire the weathered look that you are striving for in the rock garden, because they are less receptive to the growth of mosses and lichens. Promoting the weathering of your rocks will give the rock garden a natural look -- as if the rocks had always been there.
Also, stick to rocks that look the same in texture, color and form. If you use rocks of similar appearance throughout your rock garden, it will have a more natural look.
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