Sorrel is a slender herbaceous perennial plant about 60 centimetres (24 in) high, with roots that run deep into the ground, as well as juicy stems and edible, arrow-shaped (sagittate) leaves. The leaves, when consumed raw, taste like a sour green apple candy.ommon sorrel or garden sorrel (Rumex acetosa), often simply called sorrel, is a perennial herb in the family Polygonaceae.
Of all the essential nutrients, nitrogen is required by plants in the largest quantity and is most frequently the limiting factor in crop productivity. 1  In plant tissue, the nitrogen content ranges from 1 and 6%.
A limiting nutrient is a nutrient necessary for plant growth, but available in a concentration insufficient to support continued growth. Once supply of this nutrient is exhausted, plant growth ceases regardless of other remaining nutrient quantities. Any nutrient can become a limiting nutrient in an ecosystem. For algae, the most obvious limiting nutrients are nitrogen, certain metals and phosphorus. Nitrogen removal is an expensive process, involving high energy and chemical costs and specialised equipment.