Techniques to Restore Coastal Scrub at a Reclaimed Quarry in Central California

Busnardo, Max J.; McClain, Charles; Schott, Kaitlin M.; Quinn, Matt; Pollock, Matt J.

doi:10.3368/er.35.4.354

Cited by 3 publications

(2 citation statements)

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“…Our findings suggest that restoration practitioners can often achieve cost-effective, successful restoration using seeds, which aligns with the conclusions of others [ 31 , 102 ]. However, the use of container plants allows for greater control of community composition [ 85 ], in particular, for those species that do not readily recruit from seed.…”

Section: Discussionsupporting

confidence: 92%

“…For one, using container plants is generally much more expensive than purchasing seeds [ 13 ], which places limits on the quality of restoration that can be achieved with a given budget. Using container plants may also be more time-consuming considering the extra labor involved in growing and tending to the young plants [ 31 ]. Although this work can be outsourced to nurseries, this would understandably increase the cost of using container plants.…”

Section: Introductionmentioning

confidence: 99%

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Is it best to add native shrubs to a coastal sage scrub restoration project as seeds or as seedlings?

McGuire

Schmidt

et al. 2022

PLoS ONE

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Ecological restoration frequently involves the addition of native plants, but the effectiveness (in terms of plant growth, plant survival, and cost) of using seeds versus container plants has not been studied in many plant communities. It is also not known if plant success would vary by species or based on functional traits. To answer these questions, we added several shrub species to a coastal sage scrub restoration site as seeds or as seedlings in a randomized block design. We measured percent cover, density, species richness, size, survival, and costs. Over the two years of the study, shrubs added to the site as seeds grew more and continued to have greater density than plants added from containers. Seeded plots also had greater native species richness than planted plots. However, shrubs from containers had higher survival rates, and percent cover was comparable between the planted and seeded treatments. Responses varied by species depending on functional traits, with deep-rooted evergreen species establishing better from container plants. Our cost analysis showed that it is more expensive to use container plants than seed, with most of the costs attributed to labor and supplies needed to grow plants. Our measurements of shrub density, survival, species richness, and growth in two years in our experimental plots lead us to conclude that coastal sage scrub restoration with seeds is optimal for increasing density and species richness with limited funds, yet the addition of some species from container plants may be necessary if key species are desired as part of the project objectives.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%