Your Sibs do have rhizomes. They're those thin, dark, hairy looking things beneath the foliage from which the roots grow. The point where the foliage and rhizomes meet should be planted 1-3" below the soil surface. Mound the soil around the foliage a bit so that water doesn't sit directly over the crown of the plant, then create a little moat around the plant to hold water when it rains or when you provide supplemental.water. Mulch well, and keep the plant well watered for at least a month after planting. Do NOT allow the soil to dry out.

Take care, also, NOT to allow the roots and rhizomes to dry out before you get them planted. Keep them in a bucket of water until you're ready to plant.

Laurie

Thanks, Laurie, those instructions are very helpful. I couldn't find info on the internet about Sibs; most articles were about Bearded.

I did soak them (which I do with anything bareroot) and planted them yesterday. I'm hoping they will bloom next year, but I know it can take a couple of seasons for them to settle in.