ben boorman wrote:

http://www.pswdistrict.org/text/articlescontent.html

The link attached has numerous articles on rose care and the results of
N-P-K on the roses.

Since you cut your roses often, where you cut them may be the cause of
the thin stems. A rule of thumb is that the cane growing from where you
cut will be half the size of the cane you cut..... A thought. You may
wish to cut the roses further down the cane then trim under water for
your vase.

ben

Ben, I have to say, this sounds like a load of hooey to me. I have
never seen this in my garden, and I cut roses every day during the season.