Even where labor and land is cheap, hot steam is needed to sterilize arable land. In September 2010 a big Dutch flower grower started to use its steam generator in its Kenyan green houses.
![Area steaming in Kenya – Flower growing](http://soil-steaming-steam-boiler-blog.com/wp-content/uploads/2019/10/Kenya_area_steaming.jpg)
Steam is mainly used to sterilize volcanic substrate so the material can be reused several times. The substrate gets steamed in steam boxes which are equipped with a vacuum steaming system. Vacuum steaming systems are highly energy efficient. The steam generator was manufactured by MSD Corp., Durbach.