I have no idea what rooting powder is made from but i suspect it has some plant growth hormone in it. I used to use seeweed feed, because its high in nitrogen and therefore encourages root growth. I have run out however and cant find the stuff here in Holland so have watered down some of my nettle feed to straw colour or a bit darker, and use that. It is also nitrogen based feed and seems to work.

Have even managed to take tip cuttings of my enormous Bay and 2 have taken. The hard wood cutting doesnt look happy but it was only 2 weeks ago i did them I am dead chuffed because ever greens are notoriously hard to propogate! My 5 rosemary tip cuttings are also doing well.

Good luck.

Sandra

ps , what are you trying to propogate?