Some of mine were still flowering until we had the snow in February so I tend to base it on how they’re doing. If you see new ones poking up then chop off the spent ones.
@TheGreenMan beautiful photo of a beautiful plant! And three? Wow! 🤩 Can I ask how often you would give them plant feed? When? Particular type? I’ve not really given any of my plants much since I planted them 😬
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The bees love it.