TerraForums Venus Flytrap, Nepenthes, Drosera and more talk
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Generally these substances are meant to penetrate into the incision site. Putting it in water after you put it on the cuttings simply washes it off. Personally, I'd re-treat the cutting and plant it in sphagnum moss, to plant a cutting:
make a BIG hole so you'll minimize contact when inserting the cutting(s) (this also ensures good application of th rooting compounds), next pack the moss firmly but not tightly, keep very moist but not soggy and as high humidity as you can provide.
The only Nepenthes I have had success in rooting in water is N. gracilis so far.
Would it maybe be good to add some of the rooting powder to the water to up the concentration a bit? I'm completely clueless about Nep reproduction but reading this thread the idea came to mind. Would that help or hurt?
Powder form (solids) rooting compounds need to come into contact with the plant material. Watering the cutting with diluted powder type rooting compound will not do much of anything if anything. The powder needs to come into contact physically and 'seal' the incision site up.
Liquid form rooting compounds like Dip n' grow and to a lesser extent Superthrive, are quick acting and better responding rooting agents in my opinion. I will water with them once the cutting has rooted and have noticed positive results.