Can I save this Den bracteosum cutting????

[Gage]

So, my wife was asking a vendor at the Tamiami show about this Den bracteosum, and when he said there were no more plants left and all he had was the example cutting he gave it to her! It's beautiful, and I know she is happy to enjoy the blooms while the cutting lasts (I have it in water for now), but I am wondering if there is anything I can do to make this cutting throw a keiki? If not, no worries.