 |
Magnesium (Mg) - Magnesium acts together with phosphorus to drive plant metabolism and is part of chlorophyll, a vital substance for photosynthesis. Like Calcium, Magnesium is ordinarily supplied through liming. Low magnesium levels in many soils will normally not cause problems provided the exchangeable cations are in good balance. If Mg levels are low and lime is required, dolomitic lime (rich in Mg) will be recommended. If Mg is low and lime is not required, Epsom salt (magnesium sulfate) may be incorporated at a rate of 5-10 lbs/1000 square feet.
Some gardeners and rosarians recommend applying Epsom salt to roses or to the soil under roses every spring. (Hint: If the area around a rose is, for example, about 5 square feet, then less than an ounce would be required, perhaps a level tablespoon per shrub.)
This site was last updated 11/22/06