I deadhead English lavenders in August/September and they sometimes reflower afterwards. Dutch lavenders keep going long into late autumn, so they get deadheaded much later. I prune both types in late winter, as much as I can without cutting into old wood.
Mine are all English. I started cutting mine back this afternoon, but was only a third of the way through when the thunder started - hopefully it will clear up later! Might try deadheading in August next year to see if I can get a second lot of flowers - thanks @edhelka for the tip!
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