Assertion: comfrey's cultivar | /r/HasProperty | developed in the 1950s
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text: Developed in the 1950s by Lawrence Hills, of the Henry Doubleday Research Association (known today as Garden Organic), at that organization’s Bocking, UK research farm site, the Bocking 14 cultivar is propagated from root cuttings called “offsets” which can, initially, be purchased from nurseries and through on-line sources.