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The wild species of this genus have single flowers and are generally less tender than the double flowered hybrids commonly found in gardens. They can often be over-wintered in the ground in many areas, if planted deeply and mulched in autumn.
28 species, all with tuberous roots, are native to dry areas in Mexico and Central America, but only four of these are seen in cultivation, and then infrequently.
To thrive without winter protection or lifting, these require a sheltered position, with fertile, but free-draining soil. Full sun is preferred.