Material such as vermiculite is used to replace Mother Earth. It is germ-free and can hold considerable amounts of water and oxygen, requiring only the addition of nutrients to grow.
我們經常在假日花市看到很多園藝素材，像「石」、「綠化莎」、「人造藻」、「火成岩」等，都算是取代土壤的「假土」；這些假土多半無菌，且具有很好的通氣保水性，人們只要澆上培養液，植物就可以生長。