Uli asked about other Ipomoea which might be grown with mulch and rain protection.Actually, there are several Ipomoea native to the US which are worth consideration. For instance, here in the eastern states we have two: Ipomoea pandurata and I. macrorhiza; in the central states there is I. leptophylla.
All of these form massive roots and can be grown as caudiciform plants. I pandurata is a common wildflower in the eastern states: it's very beautiful when in bloom, but many insects seem to find it tasty, and it's hard to find wild plants which don 't look a bit ragged - or to get seeds which are not infested with larvae.
I have grown I. pandurata and I. leptophylla and look forward to growing I. macrorhiza.
My I. lindheimeri will probably spend the winter in a cold frame. I like this one a lot - thanks Uli.
Jim McKenneyMontgomery County, Maryland, USA, USDA zone 7, where it is very dry and gardens are looking dusty and droopy.
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