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San Diego thorn-mint Acanthomintha ilicifolia

Goal: Maintain large populations, enhance small populations, and establish new populations of San Diego thornmint or pollinator habitat to buffer against environmental stochasticity, maintain genetic diversity, and promote connectivity, thereby enhancing resilience within and among MUs over the long-term (>100 years) in native habitats.

local NFO 2017, 2018, 2019, 2020, 2021 SO
MGT-IMP-IMG ACAILI-3

Management units: 3, 4, 5, 6

Beginning in 2017, conduct routine management actions identified through the IMG monitoring at San Diego thornmint occurrences on Conserved Lands (see occurrence table). Depending on the type and level of threat, management should only be conducted as needed, not necessarily every year, and using BMPs with precautions to do no harm.

Action Statement Action status Projects
IMP-1 Perform routine management activities as needed, such as protecting occurrences from disturbance through enforcement and controlling invasive non-native plant species to =20% absolute cover. available for implementation San Diego Thornmint Restoration
IMP-2 Submit project metadata and management data to MSP web portal. available for implementation San Diego Thornmint Restoration
Criteria Deadline year
Routine Management Completed as Needed Based Upon Monitoring Recommendations 2021
Threat Name Threat Code
Altered fire regimeALTFIR
Human uses of the PreservesHUMUSE
Invasive plantsINVPLA
Urban developmentURBDEV
Code Obj. code Statement
ACAILI-2 MON-IMP-IMG Beginning in 2017, annually inspect conserved populations of San Diego thornmint (see occurrence table) using the regional rare plant IMG monitoring protocol to record abundance and collect covariate habitat and threats data to determine management needs.
ACAILI-4 MGT-DEV-BMP In 2017, continue refining BMPs developed for San Diego thornmint (CBI 2014) by incorporating results of management experiments to control invasive species that threaten populations (e.g., Brachypodium removal studies at Mission Trails and South Crest) and based on research studies (e.g., seed bulking guidelines, seed transfer zones).
ACAILI-6 MGT-PRP-MGTPL In 2018, begin preparing a section for San Diego thornmint the MSP Rare Plant Management Plan that prioritizes management actions to maintain or expand occurrences on Conserved Lands based upon an assessment of data on occurrence status, habitat and threats. Prioritize management recommendations to maintain large occurrences and enhance at least 3 small occurrences (see occurrence table). Minimum criteria for enhancement are to reduce invasive annual nonnative plants and thatch to less than 20% absolute cover within the occurrence
ACAILI-9 MGT-PRP-SBPL In 2018, begin preparing a section for San Diego thornmint in the MSP Seed Collection, Banking and Bulking Plan to preserve genetic diversity and rescue occurrences in case of catastrophic disturbance. The plan should incorporate best science and management practices (Wall 2009, KEW 2016) and recommendations from the 2016-2017 genetic study to provide guidelines for collecting and storing seeds over the long term at a permanent, established conservation seed bank (e.g., Institute for Conservation Research Native Plant Seed Bank, Rancho Santa Ana Botanic Garden Seed Conservation Program) and for providing sources of seeds for management purposes. The plan should include recommendations for: collecting and storing seeds for conservation banking; management oriented research; rescuing occurrences after catastrophic disturbances; and seed bulking and out-planting to augment extant occurrences or to establish new occurrences with consideration of genetic implications for population sustainability.