Creating the right soil mix is imperative for overall plant health.We recommend using a free draining mix that dries relatively quickly for most Trichocereus Species.Mr Prickles Standard Mix consists of the following.50/50 Mix (Organics/Inert) 50% Premium Potting Mix. (100 L)25% Coarse Perlite. (50 L)12.5% Coarse Scoria or Zeolite (25 L)12.5 % Rockmineral (25 L)You can also add other Amendments to the soil mix such as:Shell Grit: ( Adds nutrients and helps with drainage) Note: Make sure you rinse well to remove fines and salt. Great addition for Lophophora Species and other rock eaters such as Ariocarpus.Compost: ( Adds nutrients and retains water.) great addition for Pereskopsis and other more water tolerant plants.Vermiculite: (Holds water and nutrients but is Inert/ Inorganic) another good addition for Pereskopsis.Coconut Coir Fibre: Holds water and nutrients and is a good addition for Pereskopsis and other water tolerant Species.