It depends on the variety.

Many of the David Austin English roses exhibit this behavior.

"Super Thrive" will elongate vegetative growth and aggravate this phenomena.
It contains a hormome that is also found in Alfalfa.

Tim

"Craig" wrote in message
...
I bought two new rose bushes a few months ago and planted them. They both
are healthy and producing roses.

One of the bushes has very strong branches. If there are a few roses on a
branch, it doesn't get limp.

The other bush is very "limp". Once a rose blooms the branch can't handle
the weight and the branch falls towards the ground.

Is this something that will improve with time, or should I toss and
replace
in planting season ?