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Gardening sheet ambrosia psilostachya
- 1. Western ragweed – Ambrosia psilostachya (am-BRO-see-uh sill-oh-STAY-kee-uh) Family: Asteraceae (Sunflower Family) Native to: Much of North America, including the S. California; common to sunny and disturbed sites in many California plant communities. Growth characteristics: spreading perennial mature height: 2-4 ft. mature width: spreading Mostly herbaceous perennial with upright stems arising from shallow rhizomes. Leaves are medium green to gray- green, often coarsely toothed or lobed, with sticky, resinous glands. Plants die back in winter, sprout in spring. This is primarily a plant of the warm, dry months of summer and fall. Blooms/fruits: Blooms in the dry season – June to November, depending on conditions. Separate male and female flowers on each plant. Male flowers in spire-like clusters at ends of stems; female flowers in leaf axils. Neither flower particularly showy – like the Artemisia flowers. Male flowers produce much pollen – many are allergic to it (‘hay fever’). Uses in the garden: Mostly used for restoration. Sometimes included in gardens for its habitat value (important plant in the wilds). Can be used on slopes. Sometimes included in medicinal gardens: traditionally used for stomach cramps, body sores and as an eye wash. Sensible substitute for: Non-native Ambrosia species. Attracts: Excellent bird and small animal habitat: provides cover and seeds/insects for food. Attracts many butterflies, moths and a wide range of other insects. This is a major habitat plant. Requirements: Element Requirement Sun Full sun to part-shade Soil Most local soils; wide pH range Water Infrequent to moderate summer water (Zone 1-2 to 2) Fertilizer None Other Management: Plant will spread rapidly if happy – may want to contain. May inhibit germination of seeds. Propagation: from seed: easy by root cuttings: easy Plant/seed sources (see list for source numbers): 8, 10, 13, 16 11/1/17 © Project SOUND