My cucumber plants are turning pale and blossome dropping off
I'm a newbie in gardening. i started growing the cucumber in pot this april and they were growing well.
3 weeks ago, the plants start to have male flowers buds and i have found some female flower bud since last week.
however, the many of the male flower buds drop off before it opened. And i found my plants are getting pale.
what's wrong with my plants? am i watering too much / less ? too much sunlight or too hot? Cause i'm living in HK and the average temperature during daytime is around 30C from May to July. Please help!