Page 144 - Tài liệu cây cảnh Bonsai4me Bonsai Basics

Parthenocissus quinquefolia/Virginia Creeper bonsai in the Cascade form
Root Over Rock Forms
In these forms, the bonsai is either planted directly into a hole or depression
in a piece of porous rock, or it is planted over a rock with its roots growing down

into a pot filled with compost. These forms replicate trees in nature that endure
an existence growing in rocky, mountainous regions and have to extend their
root systems over barren rock to find enough sustenance to survive.