What type of soil do Gallica like? I'm wondering if all the old classes of roses from Europe and the Mediterranean areas need similar conditons.

I'm assuming they come from areas where the soils are more neutral or alkaline, and are perfectly garden like.

My area of Missouri (Z5b) is acid clay with lots of rocks, and receives all weather extremes. Winters don't have reliable snow cover, and are usually windy, with -20F for a few days in most years. Summers start with humidity, and become hot very quickly, 110F and end in drought. Our total rainfall per year averages 20-25".