29. Roses used to be known to only bloom in the Spring, but in the 19th century something happened that changed that, and roses began to be developed that bloomed repeatedly into Summer and Autumn. What happened to change the blooming habit of roses?
From Quiz The Red Red Rose
Answer:
The crossbreeding of China roses with European variants
China roses, for the most part, had small, relatively unattractive, blooms, but those blooms appeared repeatedly throughout the Spring, Summer, and Autumn. Crossing the China roses with the European roses produced new roses with large attractive blooms that bloomed repeatedly through Spring, Summer, and Fall.