Spearmint Juniper Turning Yellow-Green in Sedona, AZ

Diagnosing a Struggling Spearmint Juniper

A Sedona, AZ homeowner's 1-year-old Spearmint juniper (Juniperus 'Spearmint') is turning yellow-green. Soil is poor. They suspect overwatering.

Diagnosis: Overwatering in Poorly Drained Soil

Spearmint juniper is extremely drought-tolerant once established and intolerant of wet soils. "Wet feet" causes root suffocation and nutrient uptake failure, leading to yellowing.

Corrective Actions

1. Stop frequent watering immediately.
2. Water only when soil is dry 2–3 inches deep. Then apply 1 inch (measure with a pan under sprinkler). In Sedona's climate, this may mean every 2–3 weeks without rain.
3. Do not fertilize. Fertilizer increases water demand and stresses drought-adapted plants.
4. Ensure drainage. If soil is heavy clay, consider amending future plantings with coarse sand/gravel or planting on a mound.

Key Takeaway

Spearmint juniper thrives on neglect—infrequent deep watering, no fertilizer, excellent drainage. Yellowing is almost always overwatering.