It's been over half a year, time for an update. I've neglected the Epipremnum cuttings. They've had little light and I watered them maybe only once a month. I think I've added fertiliser to the water just one time. I'm honestly surprised that almost all of them survived and grew new leaves. Anyway, here's a comparison between August and now:
Epipremnum aureum, moler clay vs Sphagnum moss:
The ones on moler clay did well, but most of the ones on Sphagnum moss are a little larger. One of the Sphagnum ones managed to get a root onto the bottom so it got all the condensation water and grew much bigger than the rest. However, a Sphagnum ones didn't make it and another one looks like it maybe won't make it either.
Epipremnum pinnatum, moler clay vs Sphagnum moss:
One of the Sphagnum ones managed to put a root into the moler clay of another cutting and I didn't want to separate them, so it's just one picture. All of them did well.
Simple data analysis, error bars show min/max:
Cuttings on moler clay had a better survival rate and were more uniform. Cuttings on Spagnum moss on average grew more leaves and longer shoots. I think this is because of the way I treated them, and not inherent to the medium. The lower survival rate could be due to underwatering, combined with a lower water retention of Sphagnum compared to moler clay. The increased growth on Sphagnum moss could be due to not using enough fertiliser, combined with Sphagnum containing some nutrients whereas moler clay is essentially inert.
Conclusion: both Sphagnum moss and moler clay are OK for cuttings even if you neglect them. If you use moler clay for your cuttings, use some fertiliser in your water occasionally. If you use Sphagnum moss, make sure it doesn't dry out for too long.
