Plant/seed under established vegetation
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Overall effectiveness category Unknown effectiveness (limited evidence)
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Number of studies: 1
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Effectiveness
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Certainty
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Harms
Supporting evidence from individual studies
A randomized, replicated, controlled study in three blackbrush shrubland sites in California, USA (Jones et al. 2014) found that sowing seeds under established shrubs had mixed effects on blackbrush Coleogyne ramosissima seedling emergence. In one of three cases seedling emergence was higher under shrubs (28 seedlings/plot) than in open areas (21 seedlings/plot), but did not significantly differ under shrubs (25 seedlings/plot) from open areas (31 seedlings/plot) in one of three cases, and was lower under shrubs (15 seedlings/plot) than in open areas (25 seedlings/plot) in one of three cases. Plots measuring 70 cm x 70 cm were placed close to mature shrubs or at least 1 m away from shrubs (number of plots unclear). In January 2010 150 blackbrush seeds were sown in each plot. Seedling emergence was assessed in between March 2010 and May 2012.
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This Action forms part of the Action Synopsis:
Shrubland and Heathland Conservation
Shrubland and Heathland Conservation - Published 2017
Shrubland and Heathland synopsis