Just popping in. Yes, split the straw vertically and slip it over the stem. Remember, this is an EMERGENCY method, and necessity was the mother of this invention. I just didn't know what else to use, and the more I stared at that drooping seedling, the more I thought, and voila! Prop it up in a straw-sleeve and see what happens.
It certainly wasn't going to hurt that leggy seedling any more than damping off because the stem was crimping.
And, yes, it takes some nimble fingers to maneuver the sleeve and the stem without causing injury. Again, what's to be lost? Actually, if you bend the straw open after you split it, and hold it open a minute, it'll give you some time before it wants to resume its curve again. Just enough to stand the seedling upright and slip the sleeve over...
I did not intend to plant a seedling in this sleeve. Light, air circulation, and watering considerations would come into play....
Hugs!
Linda
P.S. They ALL made it! And, of course, if you put the light on them from the beginning, there'll be no need for this tip!