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In a pot similar to the size used for lettuce, sow seeds as directed. You can expect to have a first harvest of baby leaves within about 13 days. Also known as roquette, arugula is an annual herb of the mustard family that adds a spicy punch to salads. ‘Astro’ is milder in flavor than some arugulas, and it's particularly suited to container planting because it's slower to bolt as temperatures rise.