I am seeking varieties of perennial plants that would work well in a drought tolerant cottage garden. Preferably the plants would be long flowering (6+ months) and easily cloned via cuttings.

So far my list looks a little slim. Currently I have:

3 Varieties of lavender
Seaside Daisy
Blue Marguerite Daisy
Cigar Plant
Wild Iris
Violet Cuphea
Lantana-Spanish Flag

These are to be interplanted with long lived/flowering annuals like alyssum, california poppy, snapdragons and nasturtiums and a few interesting but non-flowering/short flowering perennials.

I was wondering if anyone might be able to suggest some other drought tolerant and long-flowering perennials to go with those mentioned above.

Thanks in advance everyone