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A potpourri (below) of old fashioned hollyhock/Alcea rosea information as a supplement to other articles.
A plant-based page rather than our usual topic-based page. It's a pivot point, one list of links to ours and others' articles that involve hollyhock/Alcea rosea.
Right: Double hybrids (bearing flowers with extra petals) come most often to mind when hollyhocks are mentioned. They are the classic, old fashioned, back-of-the-barn, in-the-alley flowers and it seems everyone grows them sooner or later.
Note: Hollyhocks are frequently confused with their close cousins, the also-vertical, longer lived, more freely seeding mallows, including Malva alcea. (pictured below.) It's an understandable error: This rose mallow's scientific name means the mallow that looks like hollyhock.