Night-Blooming Cereus (Epiphyllum) Overwatering and Yellowing Leaves

Diagnosis: Chronic Overwatering

Watering 1–2×/week for a cactus is fatal. Your Epiphyllum's yellowing leaves, spreading brown spots, and lack of blooms for 2 years all point to root rot from excess moisture.

Correct Cactus Watering

• Bone dry before watering. Skewer to bottom of pot—must come out completely dry.
• Summer: every 2 weeks (outdoors in shade) or 10–14 days (indoors).
• Winter: once a month.
• Water thoroughly, drain completely. Never leave in saucer water.

Soil & Pot

• Cactus/succulent mix (or 1:1 potting soil:perlite/pumice).
• Pot no wider than 10 inches. Must have drainage.

Light & Blooming

Your west exposure (6–8 hrs sun) is perfect. Epiphyllums need high light to bloom. To trigger flowers: cool nights (50–55°F) and long nights (14 hrs darkness) in fall/winter.

Recovery Plan

1. Stop watering until soil is bone dry throughout.
2. If stems are mushy, unpot, trim rot, dust with cinnamon, repot in fresh cactus mix.
3. Resume correct watering schedule.
4. Fertilize with cactus food (low nitrogen) monthly spring–fall.

Brown Spots on Old Leaves

Likely old sunburn or fungal lesions from past overwatering. They won't heal but won't spread if you fix the watering. Remove severely affected leaves.

Your plant can recover—Epiphyllums are resilient. The blooms will return once roots are healthy and it gets its cool/dark rest period.