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Smyrnium perfoliatum is an old cottage garden favourite and flower arrangers have known of this curious plant for ages. The stems, holding umbels of acid greeny-gold flowers appear from within the foliage which also turns gold at flowering time. This plant is rarely offered but once you have it will always be with you. Plants take a few years to mature and then flower with profusion then die (monocarpic) and must be allowed to self-seed. The young plants go dormant in the summer, dyeing down to a until the following year. It sounds complicated, but it is very easy to grow. It may not conform to perennial norms, but is well and well worth the effort to grow.