What Affect Does Epsom Salt Have on Plant Growth?

Perhaps Shakespeare knew the wonders of Epsom salt. After all, it was first discovered in the springs around Epsom, England, during his lifetime and very close to the Bard's old stomping grounds. Epsom salt is actually magnesium sulfate. There are many uses for Epsom salt and one of them is as a soil amendment in the garden. The effect Epsom salt has on plant growth depends, largely, on what kind of soil the plant is growing in.

Magnesium Deficiency

If the soil is deficient in magnesium, the addition of Epsom salt will be a benefit. Epsom salt contains magnesium which is used by plants for photosynthesis.

Sulfur Deficiency

Sulfur, another ingredient in Epsom salt, is important for plants because it helps them prepare for the cold weather, by making them hardier. It also assists in seed growth. The addition of sulfur to a soil deficient in it is beneficial for plants.

Soil Chemistry

Adding Epsom salt to soil that already contains enough or even high levels of sulfur and magnesium could result in an imbalance of soil chemistry. When the chemistry of the soil is out of balance there is a danger for a reduction of oxygen available to the roots of the plant.

Roses

Rose aficionados swear by the use of Epsom salt in the garden. According to Erica Glasenor, a horticulturist, adding 1 tbsp. of Epsom salt to a gallon of liquid fertilizer will aid in the production of more canes on your rose bushes and more roses.

Peppers and Tomatoes

Pepper and tomato plants love magnesium, especially when they are in blossom. This is a good time to apply Epsom salt by adding a tablespoon to a quart of water and spraying it on the plants until they are soaked.

References

• The Canadian Organic Grower
• Epsom Salt Council

Resources

• Cool Greenery