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N YEARS when I fancy exhibiting flowers in a local show, I grow sweet peas on the so-called ‘cordon system’. This involves training single plants up 2.4m bamboo canes, tying the stems in frequently, and punctiliously trimming off tendrils and side-shoots, thus thwarting the natural scrambling habit of . All the plant’s energy goes into flowering, so this is the surest way to achieve really long, straight stems and four, well-presented flowers on each stem.