This article was co-authored by rob litman. Rob litman is a landscaper, general contractor, and the ceo of vitoli inc. , a landscaping, hardscaping, ecoscaping, and swimming
pool design company in los angeles, california. With over 20 years of experience in construction, rob specializes in energy-efficient and drought-tolerant landscaping. He holds general building contractor (class b) and registered pool/spa contractor licenses. In 2007,
rob won house of the year in gardena, california. Wikihow marks an article as reader-approved once it receives enough positive feedback. This article received 16 testimonials and 92% of readers who voted found it helpful, earning it our reader-approved status.