Give plants as much space to spread their roots out, relative to what they can use or need. Alternatively, you can place inside a decorative pot. Create focal points with volcanic boulders. 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. Conclusion Use eye protection if you are drilling or chiseling into the material. 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. Remember, lava rock is lightweight so the odds of this happening are higher than with other gravel. How to Use Rocks in Your Landscape Natural stone is one of the most versatile elements available for a landscape makeover. Would lava rock intended for the barbecue be ok to use … Make sure that it has contact with plant roots. The stones can be placed on pathways to give a colorful design effect, or used as border decorations. Landscaping with rocks adds texture and contrast, providing durable groundcover that requires little or no maintenance. 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. 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. Lava rocks do not decompose, only requiring replacement as they are blown, washed or kicked away. 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. Smaller lava rocks are used as mulch to collect water and to avoid erosion. To apply your rock dust, simply sprinkle it onto the top few inches of your garden bed and gently till it in. Fill in bare areas with small stones. The best part is they can be rearranged unlike moss on a large piece of driftwood. If you don’t want to add weight, try some of the inexpensive or free suggestions above and skip the expense of lava rock. The edges are extremely sharp. Lay the lava rock in a layer around the base of the plants and throughout the flower bed. I heard lava rock holds roots and mosses well since it is porous. Using volcanic rock dust in your garden is a simple process, but … Use thick gloves when handling feather rock or other lava rocks. 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. Use rocks in home landscaping to protect plants, reduce erosion and add interest. Lava Rock for Plant Drainage? Additional Tips for Using Volcanic Rock Dust. Lava rock is best used in beds that feature shrubs and other tall plants, because of its thickness. 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. Do not allow the lava rock to rub the trunks and stems of the plants, as it could cut the plant… If you MUST use gravel or rocks, do so outside the bottom part of the pot. This rock is lighter than other rocks used as mulch, so it is easier to work with. I have seen many great pictures of mosses covering rocks and making nice mounding forms. 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 … Gardeners and garden architects use lava rocks for decorative and water retaining purposes. Once you have the hole or dimple you wish, press potting soil into the bottom and then add the plant. Mulch to collect water and to avoid erosion add the plant they experience in nature of the plants and the... 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