Narrowleaf Mule-ears

Year-round

Narrowleaf mule's ears, also called California compassplant, is a California native perennial wildflower. Its range runs through the Coast Ranges from the immediate coast into the Sierra foothills, including grassland, oak woodland and coastal prairie habitat across the greater San Francisco Bay Area. Bright yellow, sunflower-like blooms appear each spring, and the plant supports a wide range of native bees and butterflies. It is adapted to summer-dry Mediterranean conditions, so overwatering during its dry-season dormancy is the main care mistake to avoid here.

• Give it full sun for the best bloom. It tolerates part shade but flowers less in a shadier spot.
• Plant in well-drained soil. It handles clay, loam or sandy soil as long as water does not pool around the crown.
• Water sparingly, no more than about once a week even in the driest part of summer, and mainly while the plant is still establishing in its first year or two.
• It is a strong pollinator plant here, drawing dozens of native bee species along with butterflies and moths, and it serves as a caterpillar host plant for several of them.

Fall

Fall is the best planting and establishment window for narrowleaf mule's ears in the Bay Area. As the first real rains soak the ground, typically October or November, the plant wakes from summer dormancy with fresh basal growth, and it is also the season regional extension guidance recommends for putting new California natives in the ground.

• Plant new narrowleaf mule's ears now. Cooler temperatures and the return of rain let roots establish before next summer's dry season, which is the planting window UC Master Gardeners of San Mateo and San Francisco Counties recommend for California natives here.
• Watch for fresh basal leaves emerging as soon as the soil is reliably wet. That regrowth signals the plant is out of dormancy.
• If dividing or moving an established clump, do it now while the plant is waking up rather than during summer dormancy or spring bloom.
• Water new plantings to help them establish if fall rain is late or light, then taper off once the rainy season is reliably underway.

Winter

Winter is active growth season for narrowleaf mule's ears in the Bay Area's mild, rainy climate. The plant holds a low rosette of leaves through the cool, wet months, quietly building toward its spring bloom, and it typically needs little from you beyond what the rain already provides.

• Expect a low rosette of leaves rather than much height. Most of winter's growth happens below ground and close to the crown.
• Skip supplemental watering in a normal rain year. Winter rainfall in the Bay Area usually covers what this plant needs.
• Watch for slug and snail grazing on winter foliage, especially in foggy or shaded microclimates, and hand-pick rather than treat chemically.
• Frost is uncommon in most of the immediate Bay Area, and this low winter rosette does not typically need frost protection here.

The green winter rosette reads as a tended, deliberate planting through the rainy season rather than a bare patch.

Spring

Spring is bloom season for narrowleaf mule's ears in the Bay Area. New growth that came up with the winter rains finishes filling out, and the plant sends up bright yellow flowers from around April into June before the dry season sets in.

• Expect flowering from roughly April through June, with 2 to 3 inch yellow, sunflower-like blooms on stems 1.5 to 3 feet tall.
• Let spring rain do most of the watering. Add water only if the season turns dry early and the plant is still young.
• Check new growth for snails and slugs, common in foggy coastal gardens this time of year. Hand-pick them instead of spraying.
• Cut a few stems for an indoor arrangement if you like, it holds up as a cut flower, and leaving some blooms to fade naturally lets the plant self-sow.

Peak bloom is this plant's showiest season for curb appeal, worth placing where it is visible from the street or sidewalk.

Summer

Summer is dormancy season. Once flowering wraps up, narrowleaf mule's ears responds to the Bay Area's dry season the way it would in its wild grassland habitat: the foliage yellows and dies back, and the plant rests below ground until rain returns. This dry-season rest is normal, not a sign of a dying plant, and overwatering through it is the single biggest care mistake to avoid.

• Let the foliage die back on its own once flowering ends, usually by mid to late summer. This is normal dormancy, not plant failure.
• Cut back on watering as soon as the leaves start to yellow, and stop entirely once the plant is fully dormant. Regular summer irrigation during dormancy risks rotting the roots.
• If it shares a bed with plants that need regular summer water, that mismatch is the real risk here. Group it with other low-water, summer-dry natives instead.
• Once it goes fully dormant, mark the spot if you tend to forget where dormant plants are. There is nothing to see above ground again until fall.

A dormant, bare patch in a front bed can look neglected to a passing neighbor. A light mulch layer or a small marker keeps it reading as an intentional planting rather than a dead spot.