Question
I'd like to make an arrangement of roses in a rectangular container. I've seen this is someone's home but I'm not sure how short to cut the stems of the roses.  The container is about 18"x6"x2".  I will be using oasis to hold the flowers.

Answer
If the container is already rectangular and you want to keep with the dimensions it already offers, you only have to cut the roses to a 6" or so length for the sides and a 4" or so length for the height to keep the proportions.  The foam will "eat" the extra length.