In my garden, 1st of June, 2020, the Netherlands. About 8 years old, 3 x 3 m, never sprayed, almost never fertilized (I keep forgetting!). Usually produces first flush, then grows a lot, then keeps blooming till October/November. Healthy, can freeze back a bit in a very cold winter (that is temps -10C or lower).
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In my garden, 1st of June, 2020, the Netherlands. About 8 years old, 3 x 3 m, never sprayed, almost never fertilized (I keep forgetting!). Usually produces first flush, then grows a lot, then keeps blooming till October/November. Healthy, can freeze back a bit in a very cold winter (that is temps -10C or lower).