Stone and or river rocks can make a great addition or mulch replacement for your landscaping. River rocks have a lot of advantages over mulch and when paired with landscape fabric they can retain the moisture in the soil just as well as mulch does. They don’t decompose over time and don’t blow away with the wind so they last forever. They go great around pool areas because they dont wash out or blow away thus ending up in your pool. River rocks are very asteicaly pleasing but the biggest advantage is that they dont need annual replacement like mulch and pine straw so they you’ll spend a lot less money in the long term.