Why Phalaenopsis Won't Bloom: Light, Temperature, and Repotting

Jeanine has 2 dozen Phalaenopsis, only one bloomed in a year. Expert addressed non-bloomers: Phalaenopsis bloom once yearly. Assume plants grow well—but old mix deteriorates, causing root rot and vigor loss. Repot annually to maintain vigor. Healthy plants need sufficient light (light green leaves) and a 10–15°F day/night temperature differential (e.g., 65°F night / 75–80°F day). Dark green leaves = too little light for blooming. East window ideal. Bloom-booster fertilizer is fine. Lengthening days trigger spring spikes (March–May).