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How is it that Monty Don manages to get tithonias in flower in the Jewel Garden in the summer, while mine don't manage to produce a flower until September when the days are getting shorter, and cooler. I get a few half-hearted looking flowers which never set seed. Is it possible to get them to flower earlier without artificial lighting?
Have you seen the size of his greenhouses, it is the additional heat that probably males the difference.