Remember, lava rock is lightweight so the odds of this happening are higher than with other gravel. Create focal points with volcanic boulders. Use thick gloves when handling feather rock or other lava rocks. Succulents have shallow root bases and install easily in depressions in the rock. Nearly all plants prefer a natural wet-dry cycle, as that’s what they experience in nature. Lava rocks do not decompose, only requiring replacement as they are blown, washed or kicked away. Lava rock is best used in beds that feature shrubs and other tall plants, because of its thickness. Lay the lava rock in a layer around the base of the plants and throughout the flower bed. Smaller lava rocks are used as mulch to collect water and to avoid erosion. The more moisture retentive growing medium/potting mix available, the less often a plant will need to be watered, as long as the pot is not too big. Using volcanic rock dust in your garden is a simple process, but … Yes, you can use lava rock, however, remember it is very lightweight, and one of the reasons why you would want to add rocks or gravel if to ADD weight. Gardeners and garden architects use lava rocks for decorative and water retaining purposes. Would lava rock intended for the barbecue be ok to use … First of all, you need to decide whether you want to use lava rocks as fixtures among your plants or you will use them as mulch. How to Use Rocks in Your Landscape Natural stone is one of the most versatile elements available for a landscape makeover. To apply your rock dust, simply sprinkle it onto the top few inches of your garden bed and gently till it in. Make sure that it has contact with plant roots. Once you have the hole or dimple you wish, press potting soil into the bottom and then add the plant. Use rocks in home landscaping to protect plants, reduce erosion and add interest. The best part is they can be rearranged unlike moss on a large piece of driftwood. The edges are extremely sharp. The stones can be placed on pathways to give a colorful design effect, or used as border decorations. Set out rocks in all one color for a unified effect, in contrasting colors -- such as black and red lava rocks -- for variety or use … 2 If you plan to use them as fixtures, then you should try to purchase large-size rocks, as they are lighter in weight and easy to maintain. Additional Tips for Using Volcanic Rock Dust. Lava Rock for Plant Drainage? Fill in bare areas with small stones. Do not allow the lava rock to rub the trunks and stems of the plants, as it could cut the plant… Instead of using rocks to prevent the potting mix from escaping through the drainage holes, (which by the way is the other reason why gardeners add gravel at the bottom) use a landscaping fabric. Give plants as much space to spread their roots out, relative to what they can use or need. This rock is lighter than other rocks used as mulch, so it is easier to work with. Conclusion Lava rock is ideal for temperature moderation as the rocks release heat at night and this can be beneficial for plants in colder regions, says SFGate. Landscaping with rocks adds texture and contrast, providing durable groundcover that requires little or no maintenance. Alternatively, you can place inside a decorative pot. I heard lava rock holds roots and mosses well since it is porous. If you don’t want to add weight, try some of the inexpensive or free suggestions above and skip the expense of lava rock. If you MUST use gravel or rocks, do so outside the bottom part of the pot. Use eye protection if you are drilling or chiseling into the material. I have seen many great pictures of mosses covering rocks and making nice mounding forms. That requires little or no maintenance collect water and to avoid erosion rock in a layer the. 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