Mexicali Onion
Allium peninsulare var. peninsulare
Care
full sun
moderate
Friendly
Yes
Bulbs eaten raw or cooked; traditional Indigenous food, used like onions
Desert regions of southern California including the Colorado Desert and surrounding foothills, below 2000 ft elevation, extending to Baja California.
Care Guide
Planting
Plant your Mexicali onion in full sun on a dry slope or flat area with excellent drainage - this native thrives in the foothill and valley grassland conditions of California and won't tolerate wet feet. The bulbs are small (8-15 mm), so you can tuck them into rock gardens, between other drought-tolerant plants, or along dry borders where they'll spread naturally over time. Plant in fall or early winter to align with the natural growing season in California's dry grasslands.
After Planting
Water moderately during the growing season and through the first year, then back off as the plant establishes - it's adapted to California's dry summers and needs little supplemental water once roots are deep. Expect delicate red-purple flower spikes in May through July, followed by dormancy as the plant retreats underground during summer heat, which is completely normal. The biggest mistake is overwatering; treat this like the dry-slope plant it is, and it will reward you with years of colorful blooms that support native butterflies and moths.
Wildlife Supported
Insects
Early season pollen source during colony establishment
Spring bloom period for pollen collection
Early spring foraging when bulbs emerge and flower
Mammals
Bulbs and foliage available seasonally; opportunistic foraging
Seed collection and caching for winter food stores