Large Leaf Sorrel Rumex Acetosa Garden Seeds. Tart leaves have lemony taste. Used as potherb, in soups, salads, or to line baking vessel for fish. High in vitamin C. Frost-hardy perennial growing 1 to 2 feet tall can live for years. Plant seeds Outdoors after frost or Indoors weeks before last frost. 45 Days for baby leaves or 120 days to full maturity. Light requirements are Sun to light shade.