I've never noticed any of the bulbils sprouting while on the plant and the initial patch I have was here when we moved in, 25 years ago......I think I will wait until they drop, they are easy to gather.
They just drop and send down a single thin root, then next year I get one small leaf, I actually pull them up by the dozens
but I get so many.
I have one Day Lily I am waiting for, I bought it last year with one flower stem, this year it has three, so pretty though, it is called Strawberry something
Regarding the bulbils, pm me your addy and I will send some in the next couple of weeks, they will start to drop anytime now......on some of the stems I have, there are over 20 buds and oh so easy