Arizona Pennyroyal. Hedeoma hyssopifolium, Mint Family ( Lamiaceae ), Arizona Pennyroyal. Also called Mock Pennyroyal. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. An annual, dicot, herb; with numerous erect branches. Arizona Pennyroyal is a sub - species member of the mint family known by the common name of Pennyroyal. Hedeoma contains a pungent oil said to be a repellent to insects, especially to fleas. Pennyroyal is a native of most parts of Europe and parts of Asia. It also is native to the Americas. It was highly prized for it's medicinal uses. We do not recommend using this plant as a medicine. The bottom photos of the flowers are taken from plants located about 20 feet apart. They have a noticably different color. Quick Notes: Height: About 12 - 20 inches. Flowers: The plant has small bluish or purplish flowers in the leaf axils. Flowering Time: May - June. Leaves: Small opposite stalked leaves about half-inch long. Found: Native of most parts of Europe and parts of Asia. It also is native to the Americas. Hardiness: USDA Zone 3a: to -39.9 �C (-40 �F) USDA Zone 3b: to -37.2 �C (-35 �F) USDA Zone 4a: to -34.4 �C (-30 �F) USDA Zone 4b: to -31.6 �C (-25 �F) USDA Zone 5a: to -28.8 �C (-20 �F) USDA Zone 5b: to -26.1 �C (-15 �F) USDA Zone 6a: to -23.3 �C (-10 �F) USDA Zone 6b: to -20.5 �C (-5 �F) USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Elevation: Can be found from 1,800 - 8,000 Feet. Habitat: Desert Washes, Streams, Woodlands. Miscellaneous: Flowering Photos Taken At Castle Creek, Arizona. April 25, 2005.

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