Is calcium, as found in lime (Ca Co3) necessary to roses?
Yes. Calcium is necessary to the healthy growth of practically all plant life. However, it is a mistake to add lime to a soil without first learning what calcium is needed and also what the Ph of the soil is, too low (acid) will need to be corrected. Lime raises the Ph value of the soil and if sufficient lime is added, will change a soil from acid to alkaline. Roses enjoy a neutral (Ph 7.0) to slightly acid (Ph 6.0) soil reaction. They will tolerate quite a variation in the soil Ph but will tolerate a greater degree of acidity than alkalinity.
