Agaves are drought tolerant, fire resistant & are usually ideal for deterring thieves when planted densely near fences and windows. The American Century Plant (Agave americana) agave theives. The next step is motion sensor lights & video cameras.
CalFlora lists the American Century Plant as minorly toxic, causing dermatitis & oxalates (kidney stones).
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Disclaimer: The Corralitas Red Car Property Blog prefers to quote reliable sources, such as CalFlora and California Poison Control on the issue of toxicity. We often get email suggesting some plants are edible. If you are eating your way through the Red Car Property, we DO NOT recommend you eat any plant you find in the Red Car Property neighborhood without first doing your own research.