Substrates without humus

This species absolutely needs a purely mineral substrate, as it does not tolerate humus.

To make the selection easier, here are the main differences of the most important substrates without humus:

Pure Mineral Substrate: well suited for all species, especially for smaller pots
Buy here

Professional Substrate for Cutting Rooting: has a high proportion of zeolite and a very fine grain,
It is therefore perfect suited for very valuable and very small plants. Also excellent for cuttings rooting, can also be used as a high-quality sowing substrate. Grain 0.5-2 mm
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Vulkastrat: suitable by the very high zeolite content especially for closed culture vessels or storage irrigation. The grain texture offers an unsurpassed stability immediately after planting.
There is a finer and a coarser grain size, so it can be adapted to the corresponding plant and vessel size.
1-4 mm buy here 
2-8 mm buy here

Vulkaponic: similar quality as Vulkastrat but much lighter. Where it depends on weight you choose Vulkaponic. suitable by the very high zeolite content especially for closed culture vessels or storage irrigation. Since the grains are rounded, this material is less stability.
There is a finer and a coarser grain size, so it can be adapted to the corresponding plant and vessel size.
2-5 mm buy here
3-8 mm buy here