Viewing post #529680 by Leftwood

growitall said: I've started using a surface layer of grit (or sand) also - it seems to discourage the growth of moss very effectively.

For me, liverworts are the worst problem that grit alleviates. Regarding moss physically inhibiting seed sprouting, I have no real experience with alpines. I can say that I have had woodland seed sprout through moss, but can't say if other woodland seed that never sprouted was due to moss or not.

Leftwood said:...with more moisture retentive mixes I would sometimes get seed germinating at the edges of the pot, rather than all over the surface. This I attribute to the faster drying of the medium at the periphery.

growitall said:Interesting... I often see that too with indoor growing and constant moisture. In my own case, I figure it's due to washing the seeds to the pot edges in the initial watering, as I often sprinkle the seeds directly on top of the soil mix, with no soil or only a little sprinkling of soil overtop.

I did think about that, but for me I think its unlikely, since I always have grit covered surface.