In North America, public awareness of hydroponics has grown by leaps and bounds over the last 20 years. The same can't be said, however, for people's knowledge of hydro culture, the technique for growing decorative plants and tropicals without soil at home or in indoor public spaces. The story is different in Europe, where hydro culture has been evolving for almost 40 years. In Holland, Germany and Switzerland, one-third to one-half of all indoor house plants and decorative plants in offices and public spaces grow without soil. Experience there shows that most plants which grow indoors in soil, grow well and require less care in hydro culture.