Leslie - If you are putting them in clay beds, make sure you amend the soil or you may have problems with frost heave this winter. The clay gets so hard when it it dry and cold out. I have lots of clay too, so all my beds are raised beds, and I have garden mix soil delivered. Depending on the number of TB's you have to plant, it may be easier for you to pot them up in large pots for the winter. That would give you more time to get the beds ready, and then you can pop them from the pots to the beds in the spring.
Fortunately we are going to get warmer again in NC and SC, so you can make sure your newly planted Sibs get good watering before it gets really cold. Keeping their soil moist is key for getting them established. Also, unlike the TB's, it is a good idea to put an inch or two of mulch over the Sibs to keep them moist. I don't mulch my TB's because we usually have damp winters and all the moisture held in by the mulch can cause the TB rhizomes to rot.
