How much to tip floral delivery person?

[Tarheel Tink]

I got a huge (2 dozen roses!) bouquet delivered at work yesterday from DH (27th Anniversary ). I was taken off guard but gave the fellow 2 dollars from my pocket. What is the normal consensus on tipping the delivery person?

 

[Chattyaholic]

I've never tipped for floral delivery. Maybe I should? I dunno.

 

[LBAK]

I usually give $2 also.