I grew Granny Grimmets in NJ. Bought it from Antique Rose Emporium. It is certainly a hybrid perpetual, which means it typically makes long canes, but it is not as stick-like as some HPs. The flowers are a lovely maroonish dark red that can work well in the garden, especially with peonies and iris. I planted it where it got a little too much shade and it stayed smallish, never reaching three feet. I think it gave up after about three or four years. Given good conditions five feet high would be about what I'd expect, too. In my own gardens, the only roses to reach terminal height in ten years were Knockout and Constance Spry.
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My belief - based on my own experience with caffeine - is that caffeine is like many other addictive drugs. Increasing the dosage feels better and better until you get totally strung out. Then you quit, crash, become totally dysfunctional, get headaches and nausea and wish you were dead. The ride up can be a lot of fun, but I don't think I could do that weekly even if it made me as rich, famous, and good looking as Brad Pitt and as smart as a typical Nobel prize winning physicist. Of course caffeine affects different people differently. Sometimes a strong cup of coffee puts me to sleep. Good luck.