Epsom salt is comprised of hydrated magnesium sulfate, a naturally occurring mineral first found in the well waters of Epsom, England. Epsom salt has a variety of home remedy applications – the two most widely known being as a saline laxative and pain reliever. What many people don’t realize is that Epsom salt also has several uses in organic gardening.
1. Counter Transplant Shock
We’ve all seen how our plants and seedlings wilt when we move them from a small pot to a larger one, from indoors to outside, or from greenhouse to ground. Try feeding transplants with Epsom salt once they’re in their new environment to help injured roots overcome transplant shock. Remember to add a layer of soil on top of salt sprinkled in holes so roots don’t come into direct contact with these concentrated minerals right away.
2. Prevent Leaf Curling
Leaf curling may also be caused by magnesium-deficiency in plants. Again, add Epsom salt to the soil around the base of the sick plant. Alternately, for faster absorption you can mix 2 tablespoons of Epsom salt in a gallon of water and apply directly to the leaves.
3. Tastier Tomatoes
Tomato vines are one of a handful of common garden residents whose fruit to plant size ratio is heavier than average, leading to an even higher likelihood of magnesium-deficiency. For this reason, tomatoes should be fed Epsom salt twice as often as other plants. Also, because tomato vines are prone to calcium-deficiency (blossom end rot), the majority of tomato fertilizers contain calcium which will compete with magnesium for root absorption. Therefore, foliar feeding is the more efficient method for delivering magnesium to these plants. Water tomato vines with dissolved Epsom salt – 2 tablespoons per gallon of water, every 2 weeks.
4. Bountiful Roses
Not only does it help roses to produce larger blossoms in greater numbers, many successful rosarians will agree that magnesium also aids in the growth of new canes from the base of the plant. And of course, Epsom salt increases chlorophyll production meaning darker leaves. For maximum benefit, roses should at the least be fed with Epsom salt at time of planting, then again at the first sign of new growth, and once more when the flowers are in full bloom. Bare root roses may also be soaked in water containing dissolved Epsom salt before planting.
5. Increase Nutrient Absorption
Many commercial fertilizers add magnesium to help plant roots take up vital nutrients (nitrogen, phosphorus, sulfur.) For those using all organic materials to feed their gardens, adding Epsom salt to soil will improve absorption naturally, eliminating the need for processed chemical fertilizers.
6. More Plentiful Peppers
Peppers are another popular garden plant with a higher-than average fruit to plant size ratio. As such, they should also be fed magnesium every two weeks to achieve higher yields of larger fruits. For hot peppers, over-watering can lead to fruit with less heat, thus the soil amendment method may be preferable in this case. Sprinkle 1 tablespoon of Epsom salt for every foot of height around the drip line of your pepper plants once per week.
7. Deter Garden Pests
While Epsom salt won’t dehydrate slugs and snails like table salt (sodium chloride), it can still be used to deter pests. Hydrated magnesium sulfate crystals are sharp and when sprinkled around plants, they can scratch and irritate the bodies and feet of unwanted critters in much the same way as diatomaceous earth. (Keep in mind that Epsom salt dissolves very easily in water, thus any amount of rain will likely wash them away.)
8. Improve Seed Germination
Using Epsom salt as a soil amendment before seeding will give your garden a powerful boost right from the start. Magnesium aids in seed germination and helps to strengthen cell walls, leading to more and stronger seedlings. For best results, incorporate 1 cup of salt per 100 square feet of tilled soil or mix 1 – 2 tablespoons into the soil at the bottom of each hole before dropping in seeds.
9. Grow Sweeter Fruit
The production of fruiting bodies is the most taxing process in the life cycle of a plant. Apply Epsom salt to fruit and nut trees, bushes, and vines using the same methods and quantities stated above to boost chlorophyll levels inside the plant cells. Increased energy means more sugar, allowing the plant to produce higher yields of sweeter, healthier fruit.