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They are specially designed roses, @silvertop.
They are grafted roses onto the top of a rootstock.
In my first house, I had the Double Delight as a bush.
I love its unforgettable smell and beauty of blooms.

Sounds lovely @silversaver888!!!πŸ˜€ It's always very impressive what can be produced with grafted plants.
I didn't know that Dwarf Alberto Spruce trees were a grafted tree, until a "full size" Spruce started to grow from one side of the dwarf tree! I am sure you have a very lovely garden!πŸ˜€