There is nothing wrong with sending women flowers. Men should be sent flowers on the same occasions that women are sent flowers.
For instance if the man has just had a baby girl, send him a congratulatory bouquet and don’t be afraid to stuff it with pink flowers You can send him flowers for an anniversary, a job promotion, for mourning, as a housewarming gift, as a party gift or simply to say I love you.
Many men are heterosexuals this day and can accept the gift of flowers. Greeting your men with an armful of blooms when he gets home from a hard day at work is also a nice idea. If you are a single woman and attracted to a man it is also acceptable to send flowers to his work – that is, of course, unless he is married in which case you are begging to be discovered. It also may not be a good idea to send him flowers if he works on a construction site or works in a very macho environment.
If a man is having a party or a barbecue that is a great time to send him flowers. He will appreciate the attempt to brighten up his hospitality. It is also a good excuse for him to have a really gorgeous bouquet that he would not normally buy for himself because it is too feminine. He can justify it by saying they were bought for the festivities.
There are also more masculine types of plants you can send to a man. No man will feel feminine if sent a gift of bamboo or a bonsai plant plus these types of plants are more like hobbies. A cactus is also a good choice because it is not very girly at all. Potted plants are a good idea because they can become a project for the male to cultivate.
Ultimately a man receiving flowers sees them the same way you do – as an expression of love and devotion. Even though they are supposed to be logical and analytical creatures they really do not need a justifiable occasion to receive them. Men love being surprised by flowers just as much as you do.