Substrate - soil mixtures composed of different natural components and their substitutes. The
most important of them: turf soil, leaf soil, coniferous soil, humus,
peat, sand, sphagnum moss, chopped peel and coconut fibers, crushed bark
of coniferous trees, expanded clay, vermiculite, perlite. The composition of the substrate adapts to the requirements of this plant. For hydroponic systems, stone / mineral wool and expanded clay are the best.
Try to maintain the pH level between 5.2 - 6.5, depending on the method of growing the plant and fertilizers.
You can make the mix yourself, based on personal experience, or consult a counselor for help.