Why doesn't epiphyllum bloom?

Epiphyllum doesn't bloom during the day, and it only blooms after eight or nine in the evening.

Epiphyllum (scientific name: Epiphyllum? (DC。 ) hey? ): Epiphytic succulent shrub, 2-6 meters high, cylindrical old stem, lignified. Many branches, flat leaves, lanceolate to oblong-lanceolate, wavy or deeply crenate at the edge, sharp at the base, short tapered or tapering into stalks, dark green, hairless, thick ribs in the middle, and the branches of old plants produce air roots.

Epiphyllum grows at an altitude of 1000- 1200m. Like warm and humid semi-cloudy days, warm and humid environment, frost resistance, avoid strong light irradiation. Epiphyllum enjoys the reputation of "beauty under the moon". When the flowers spread gradually, it takes 1-2 hours to wither slowly, and the whole process is only about 4 hours.

The flowering period of epiphyllum is usually from June to 10, and the flowering time is usually after 8-9 pm, mostly around 10, and the flowering time is only 3-4 hours, which is very short.