Hollyhock

Helena Rutherford Ely says in her 1903 book A Woman’s Hardy Garden, “No one can have too many hollyhocks. Plant them at the back of the border, among shrubbery, along fences, and in good clumps in any odd corner, or around buildings; they are never amiss, and always beautiful.” Z3.

Herbaceous Perennial Plants

When you receive your order, open the bags and check the stock. Roots and crowns should be firm and pliable. If they are slightly dry, add a little water or, if they are going to be potted up soon, wet the roots. Generally, a little surface mold is harmless and will not affect the plant’s future performance. If you cannot pot them up immediately, store them in a cool (35–40°) location for a short time.

Do not plant bare-root perennial plant crowns directly outdoors.

Pot up the rootstock using well-drained potting mix in a deep 6" pot or a 1-gallon container. Avoid coiling the roots in under-sized containers.
Grow newly potted perennials for a few weeks in a protected location in indirect light at 50–60°. Wet and/or cold conditions for an extended period may cause rotting.
Transplant outside once they show some top growth and the danger of frost has passed.

For more info:
About planting bare-root perennials.