Inducing Bloom in Indoor Night-Blooming Jasmine (Cestrum nocturnum) at High Altitude

A 5-year-old Cestrum nocturnum in a Colorado solarium (8200 ft, Zone 7) grows vigorously but never flowers despite high-phosphorus fertilizer trials.

Core Issue: Nitrogen Excess

Nightshade family plants (Cestrum, tomato, tobacco) produce foliage at flower expense with high nitrogen. Your regular high-N fertilization created a vegetative monster.

Corrective Strategy

• Stop all fertilizer for 2-3 months—induce "lean soil" flowering response
• Resume with bloom formula only (low N, high P/K) at quarter strength
• Ensure geraniums/lavender bloom—confirms adequate light
• Accept low humidity—Cestrum tolerates dry air if roots are moist

Bloom Cycle Reality

Cestrum blooms in cycles year-round when conditions suit. Your plant is healthy—just overfed. The dramatic light cycle at 40°N latitude isn't the barrier; nutrition is.

Patience after fertilizer withdrawal usually triggers flowering within weeks.