Calcium (Ca) deficiency is a plant disorder that can be caused by insufficient level of biologically available calcium in the growing medium, but is more frequently a product of low transpiration of the whole plant or more commonly the affected tissue. Plants are susceptible to such localized calcium deficiencies in low or non-transpiring tissues because calcium is not transported in the phloem.[1] This may be due to water shortages, which slow the transportation of calcium to the plant, poor uptake of calcium through the stem,[2] or too much nitrogen in the soil.[3]