lobelia in pouches

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Expert advice please! I planted for my mum Lobelia 'string of pearls' in Lakeland flower pouches. They have been wonderful (if you like that sort of thing) but unfortunately she's been in hospital for 5 weeks. My question is, they are looking slightly tired: if I cut them right back and feed them, will they regenerate? I'm hoping she will be home by August.

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[Rhubarb Thrasher]

yes I'd think so. They're perennials so they should recover