I was lucky enough to be able to purchase this plant locally so it didn't go through any shipping stress. I don't know how frequently they flower or if they are self-compatible. I've certainly never seen D. graomogolensis seeds for sale.
I've heard that yes, D. graomogolensis is self-compatible, but they are not prolific seed-setters nor do they flower regularly it seems. Also, I've heard reports that this plant prefers growing in sphagnum moss mixes if temperatures get warm (my own plant seems to concur), and I try to avoid feeding solid foods to my South American plants as the leaves seem to go bad easily. Liquid fertilizers are better tolerated.
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I repotted my gmall grao yesterday into 100% milled sphagnum. I think the mix I had it in either held too much water, or there was an air bubble in the media that made the root tip dry up since the root didn't look like it did when I first recieved it and potted it. Hopefully it will do better now.
Just spray it directly on the leaves.
I don't spray, I use a pipette to drop it on the leaves, so as to avoid most risk of it getting into the soil and either messing up roots or causing algae to grow (neither is a very good thing).