White flowers are usually connoting innocence, elegance, honesty, perfection, and purity. It is also a symbol of unity and strength. Though, in some culture, the white flowers indicates sadness. Others take it as a symbol of their apology that is why they send white flowers to someone they want to reach out for a sorry.
During weddings, they usually use white flowers for the bridal flower. The white flowers signify endless loyalty and thoughtful love.