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RE: Interval between Flushes (Follow-Up #3)

posted by: luxrosa on 05.17.2010 at 08:03 pm in Antique Roses Forum

I began this by just listing the average months of bloom per class, if you want to know how I came by those numbers read part A.

Part A. I had an opportunity to do a bloom count according to rose class and cultivar, after I suffered a spinal injury and I could not move very much for 3 years. I lived on a property that had 187 different rose cultivars in 14 different classes, and sought to study the bloom habits of each rose class, and document bloom production in a precise manner.
I'm a bit of a perfectionist when it comes to documentation, and it was important to me that this count be accurate, absolutely precise. I was encouraged to do this after a conversation with a freind who grew roses who had declared "Hybrid Tea roses bloom as often as Tea roses, it says so right here in the vintage rose catalog". She showed me that in that book most of the Hybrid Tea roses were rated RRR for rebloom, and most Tea roses were also rated RRR for rebloom.
I knew that Tea rosebushes bloomed more often than Hybrid Teas, but I had no way of proving it without documentation.
I counted every rose on each of the 187 rose bushes and noted the date of each bloom cyles begining and date of ending for 2 years.
Oakland, California. Mediterranean climate.
After 2 years of documentation the analysis showed:
Two rose classes produced far more weeks of bloom during a years span than any other. I call these the two
Superblooming rose classes: China and Tea.
1. Rated A+ China Roses of this class dependably begin bloom in Jan-Feb and rebloom rapidly all year through December in a Mediterranean climate. Extended bloom season due to evergreen foliage, and rapid remontancy is aided by slender, short pedicles.
2. Rated A. Tea. Also known as Old Garden Tea. Extended bloom season due to evergreen foliage, fast re-bloom rate aided by short pedicles. Of all the rose classes that produce large and/or many petaled roses, none come close to Tea, for rapid re-bloom coupled with an extended bloom season.
I would use M for rating for these two classes, one M per month of bloom.
China: MMMMMMMMMMM-M 11-12 months of bloom.
Tea: MMMMMMMMM-M 9-10 months of bloom.
A garden of a dozen mixed cultivars of China and Tea rosebushes will produce bloom during all 12 months of the year, compared to a garden of a dozen mixed cultivars of Hybrid Teas, in the same climate can only produce 3-4 months of bloom, due to the long period of dormancy produced even in a Mediterranean climate, and long pedicles (flower stems) which slows down rate of re-bloom considerably.

The length of a bloom cycle in China and Tea rosebushes can over-lap, with one bloom cycle starting while the last is finishing.
Noisette: B+ rating
MMM-M 3 to 4 bloom cycles per year.
Tea-Noisette roses can produce an extra bloom cycle in the winter. MMMM-M
Noisettee rosebushes get a later start in spring, but continue to bloom late in Autumn.
B. Florabunda, Polyantha, and Austin roses that were bred Florabunda roses.
MMM-M 3-4 to 4 and 1/2 months of bloom per year.
The average length of a bloom cycle of a Hybrid Tea is on average 28 to 33 days long, and even in our Med. climate roses of this class only produce 4 months of bloom at best due to a long winter dormancy. Polyantha, Florabunda and a few Austin roses that were bred from Florabunda cultivars produce a bloom cycle that is slightly longer than that of an average H.T.. Polyantha, Florabunda, and those few Austin roses are likely to continue to bloom a month after the H.T.s have become dormant for the year..

C+ to C rating depending on cultivar.
Hybrid Tea MMM-M 3 to 4 months of bloom.
Hybrid Musk:MMM 3-4 bloom cycles per year.
Hybrid Perpetual MMM 3 bloom cycles per year, in our Med. climate all the Hybrid Perpetual rosebushes studied bloomed as often as the average Hybrid Tea rose cultivars, which was a surprise to me. These include "Grandmothers' Hat" "Arrilaga" "Sydonie" "Mrs. John Laing" "B. Prevost"

I hope this is of some use to you.
I was very strict in my counting and used this method:
quartering each bush with tape, and counting each bloom per section, seperating the counted blooms with green gardening tape.



clipped on: 05.26.2010 at 05:52 pm    last updated on: 05.26.2010 at 05:52 pm