Try the 2003 US National Arboretum "Web Version" of the 1990 USDA Plant Hardiness Zone Map

Here is a link that might be useful: 1990 USDA Plant Hardiness Zone Map - SE USA

Both your catmint and Speedwell are cold hardy to USDA Zone 4 (-30 degrees)so it should not be a problem in South
Carolina as long as you don't get any colder than that.
As to rooting your Roses I use Pine fines and silica Sand
(Play Sand)for rooting lots of plants(yes roses too). It gives good drainage so the cuttings don't rot after roots have formed.
You may want to try several different times of the year ie
dormant,spring or early summer or even fall cuttings.The most important thing is do not let them dry out during any part of the process. If you go to the Antique Rose Emporium's web site click on Rose culture and scroll down until you see what your looking for. The timing varies from diferent varieties of roses as to when is best for rooting them.I would also recommend a liquid rooting hormone over
the powder forms.Good luck!

thanks for all thew help on rooting roses.