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I have grown over 100 of these from seed this year, but it doesn't say on the packet about pinching the growing tips out to make them bushier.
Does anyone happen to know whether this needs to be done please?
Sorry Mups I can't help, I've always bought ready-grown plants. What I have discovered is that they can survive a mild winter. I've had four plants survive in the garden this last winter and they look very healthy.