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I have no idea either -- my guess would be late autumn so it can be ready to bloom again by April

I had to Google it. According to Google AI overview ...first pruning happening in early to mid-summer after the flowers fade, and the second pruning in late winter

Oh, well, they missed the summer one entirely, because you can see those seed pods hanging there if you look carefully ... so we will see if they Googled what you did by the late winter!