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To find the number of daisies, we need to divide the total number of flowers by the sum of the two parts of the ratio (3 + 2 = 5) and multiply by the number of parts for daisies (3).
Number of daisies = (Number of flowers / Sum of ratio parts) * Number of parts for daisies
Number of daisies = (30 / 5) * 3
Number of daisies = 6 * 3
Number of daisies = <<6*3=18>>18
Michelle should plant 18 daisies in her garden.