Lava rock enhances the aesthetic appeal of beds because of color and texture. These rocks are awesome for regulating temperature in gardens because they heat up during the day and release that heat at night. Red lava rocks are used in fire features as well. Red lava rocks can bring many benefits to your landscape projects. This lightweight landscape stone will improve the aesthetic of your landscape beds. Some of the advantages include: – Weed suppression – Decreases soil temperatures – Retains moisture Lava rocks eventually break down into lava sand, which is good addition to garden soil. Lava rocks can also being used in fire pits and fireplaces.