It is common in park areas, greened courtyards. Some of the vacant lots were "greened", with plantings of trees, grass, and small fences. The park space was extended and greened with plantings. The area has since been cleaned and greened. Through bio-phyto-remediation techniques, the soil and water would be "cleaned and greened". Today, it is estimated that about 10% of all German roofs have been "greened". Most greened quartz (Oro Verde) is also irradiated to achieve the yellow-green color. Other names for green quartz are vermarine, greened amethyst, or lime citrine. They are (nowadays) greened and covered with pines. In addition, Three Squares Inc. also greened the Hollywood premiere and gala for Inception. Furthermore, permanent care and irrigation is usually necessary to maintain the greened environment. The land has greened up and the park's management is reopening many of its sections.