She fills the vase halfway with Lightweight Expanded Clay Aggregate (LECA), a potting soil replacement that plant enthusiasts are loving, before adding sphagnum moss and potting soil. She plants ...

After hundreds of years of development, Philadelphia has lost much of the organic matter, minerals, sand and clay that make up natural soil ... products like cups and vases.

Sandy soil is pale coloured and has large particles. These create lots of small air gaps. Water drains through them easily so it usually feels dry. Clay soil is usually sticky and has small particles.