Hi Michael,.
I use it several times, but always only for same tuber; the biggest pots have to about 20 cm.
Whether this works with a "bed" in normal peat-based substrate, I venture to doubt.
Sphagnum is eh already getting wet, as it neatly pours, and if still a "mantle" drum, I could imagine that's too wet and too poorly ventilated (low pore volume).
Pure Sphagnum is probably only for the Group of titanum, hewittii, borneensis etc, really good so from always humid, tropical areas.
What I still do in addition to pure Sphagnum is adding rel little unit Earth (70% white peat, 30% clay) to the Sphagnum, something to increase the storage capacity of the nutrient. I've done this for one hirsutus and that liked the.
What's the cost, you're right...
I once bought 1 kg on ebay for €14 from Terra exotica as an offer and zehre still...
This was however not pure Sphagnum, as also Laub(Stücke) were included.
On the hp, it is not available for the price:
http://www.Terra-exotica.de/bodengrund/Moos-und-Laub
Ronny has purchased from Amazon and I remember that that was really pure Moss:
https://www.Amazon.de/Sphagnum-Moos-aus-...s=Sphagnum+Moos
I have still some titanum and koratnesis/paeoniifolius in Seramis stand; the koratnesis/paeoniifolius look good, I don't; know how it looks when the titanum in the Seramis, the journal of titanum still handsome.
Ronny has experienced the same thing as you – post # 56 here:
Seramis as Subtrat for difficult species (titanum, gigas, decus-silvae etc.)
LG, Bernhard.