Alcea Rosea (Hollyhock)

Question from Shoot User

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I have a very small alcea which I have been trying to mature in a small pot (3"d). It only ever has 3 leaves, approx 3" high. Every few weeks one leaf goes mottled, and this increases until the leaf curls up and dies off. Another leaf come up from below but this is recurring and the plant is not establishing itself. Is it rust? Is it something else? What do I do?