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Missouri Botanical Garden PlantFinder lists Origanum majorana as a tender perennial winter-hardy to USDA Zones 9 to 10, grown as an annual elsewhere, in full sun with dry-to-medium water and neutral-to-alkaline soil. NC State Extension states the same range at finer granularity: USDA hardiness zones 9a, 9b, 10a, 10b.
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Heat and drought tolerant (Missouri Botanical Garden); NC State Extension lists tolerance/resistance to deer, drought, dry soil, heat, poor soil, and rabbits, and notes the plant is intolerant of poorly drained, saturated soils where it rots.
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Plotwright Heat Tier Warm-Extreme per ADR 0021 — a Mediterranean culinary herb with documented heat + drought tolerance; thrives in hot, dry summers and is most reliable as a true perennial only in the warm zones 9-10 where it survives winter.