I ordered from DP Flowers Bangkok as they were one of the few florists I could find in the Sukhumvit area doing evening deliveries. Not only were the flowers well received, but the constant updates and photographs throughout the delivery process gave me reassurance of everything going smoothly. I ended-up recommending DP Flowers to someone else wanting to get in touch with a girl he'd met at a gogo bar on Soi Cowboy to let her know his telephone number had changed, so I suggested delivering her flowers with a message to that effect. He did so and had the same positive feedback as me. So, consider this a double recommendation for DP Flowers Bangkok!
