Owl's Clover

Name: Owl's Clover
Brand: Outdoor Dream Builders

Castilleja exserta

Dense spikes of rose-pink to purple blooms paint the desert floor in spring, creating a wildflower spectacle.

A cool-season annual in USDA zones 9-11; early-fall-sown for spring bloom in the low desert, it finishes before summer heat and depends on reseeding to persist.

AMWUA Notes

A low-water native wildflower that creates iconic spring color; best broadcast among companion plants it can lightly parasitize.

Care Guide

💧Watering

Rely mainly on winter rains, supplementing every 2-3 weeks in dry spells; it needs consistent cool-season moisture to establish and bloom.

✂️Pruning

None; this tiny annual simply flowers and sets seed, then dries — leave it in place to reseed before clearing.

🌱Fertilizing

None needed; it thrives in poor native soil.

🛡️Pests

Trouble-free.

☀️Seasonal Notes

A cool-season desert annual best sown in early fall; it is partially root-parasitic, so it establishes best interplanted among grasses and other wildflowers, and reseeds to return.

Soil, Feeding & Propagation

🪨Soil

Lean, sandy or gravelly native soils; best interplanted among grasses and wildflowers it can lightly root-parasitize.

💧Drainage

Needs well-drained soil.

🌱Nutrient Needs

None — thrives in lean desert soil without fertilizer.

🌰Propagation

Seed; sow in early fall (cool-season) broadcast among host grasses and wildflowers, and it reseeds.

📐Spacing

0.5 ft

🌳Roots & Placement

Partially root-parasitic, so it establishes best among companion plants; reseeds to persist, with no invasive roots.

Placement Tips

•Sow in early fall broadcast among grasses and other wildflowers, which it lightly relies on as hosts.
•Mass in bold drifts for the classic desert spectacle of rose-purple spikes.
•Interplant with poppies and lupine for a layered spring wildflower tapestry.
•Leave plants to dry and drop seed to renew the colony each year.