Petitgrain is steam-distilled from the leaves and twigs of bitter orange (Citrus aurantium var. amara) and bridges the aromatic world between bright citrus peel oils and the floral depth of neroli, with a woody-green-herbaceous character anchored by linalyl acetate (45-60%) and linalool. The dominant ester-alcohol pairing confers a calming quality: a controlled human study found that inhaling petitgrain oil improved task performance in university staff, attributing the effect to autonomic rebalancing driven by linalyl acetate, linalool, and myrcene.^[1] Seasonal analysis of the leaf oil confirms that linalyl acetate content peaks in autumn and that the oil also carries meaningful antioxidant activity.^[2]