Yes, put them in potting soil. I do that every year. It actually works better for me than planting them directly in the ground, especially if the ground is cool. I let my slips grow in pots for a couple of weeks and then transplant them into the ground like any other vegetable.

Never, ever put sweet potato slips in the fridge. It will kill them.

For best rooting success, plant the slips into moist potting soil on a heat mat and cover with a grow dome or plastic tent. Keep in a bright area out of direct sunshine and they will root in 3 days. The roots will colonize a 4" pot within 7 to 10 days. Take off the dome and turn off the mat as soon as they root, but don't let it get below 70 degrees.

This post was edited by Slimy_Okra on Sat, May 10, 14 at 22:35

Thanks Slimy! I'll go put them into pots immediately.

If the slips are not well rooted, I would put them in water for a few days.

Hmmm. . they're in pots now. A few small roots.
Watered well last night -- will hope for the best.

Sweet potatoes grow great in containers (See video link for growing tips)

http://youtu.be/qLjnd2K7-uU

Here is a link that might be useful: Growing and Harvesting Sweet Potatoes in Containers