What's the difference between 百花 and 白花?

Today I came across the expression, 百花滿發 (백화만발), which means "All kinds of flowers are in full bloom."

• 百花 (백화) : all kinds of flowers (百 = 100; 花 = flower)
• 滿發 (만발) : full bloom (滿 = full; 發 = bloom)

I am writing this because I did not know the meaning of 百花 until today. Of course, if I had seen the Chinese characters, I would have known its literal meaning of "100 flowers," but I would not have known that it is also used to mean "all kinds of flowers." If I had seen or heard the Korean 백화, my first thought would have been "white flower" (白花 - 백화).

It seems to be quite common to use 百 (100) with other characters to mean "all" or "various." Other examples are as follows:

• 百計 (백계) : all [every] means; all resources
  百計(백계)을 다 쓰다. Try every means available.
  百計 無策 (백계 무책) : helplessness
  .
• 百憂 (백우) : all [a variety of] concerns
  The Chinese name for the antidepressant drug "prozac" seems to be 百憂解 (백우해), which literally means "relief from all concerns."
  .
• 百行 (백행) : all [a variety of] behavior or conduct
  孝百行之本也 (효百行之本也) - Filial piety is the foundation for all conduct.

If anyone has other good examples of using 百 to mean "all" or "a variety of," please post them in the "Comments" section.