The Greenfield variety (also known as P-20 or Expt. 320) is an open-pollinated lettuce variety. Externally, it is distinguished by the intense green color of its leaves, which do not curl inward at the top of the plant upon reaching maturity.
The plant belongs to early-maturing varieties and is characterized by uniform ripening, which ensures a concentrated harvest period. The produce possesses good transportability indicators.
The variety shows resistance to the Oshita virus and tolerance to corky root rot. It was initially recommended for cultivation in the coastal valleys of California and regions where Romaine-type lettuce is grown.
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Countries of admission
1 jurisdiction
Green indicates countries where the variety is listed in the national catalogue and its seeds are authorized for sale. Expired registrations are marked separately: the variety was previously admitted, but sale is no longer permitted.
Variety registered as early as 1
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data for which we do not publish: their registry licenses have not yet been verified. This section will be available upon verification.
Variety in registries
Regions of admission, rights holders, and status of plant breeders' rights
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