Aside from the anecdotal evidence about human benefits, Epsom salt does seem to help plants. Generations of gardeners have said it helps their plants grow bushier, produce more flowers and have better color. It's also said to help seeds germinate and repel slugs and other garden pests.
Epsom salt can improve the blooms of flowering and green shrubs, especially evergreens, azaleas and rhododendrons. Work in one tablespoon of Ultra Epsom Salt per nine square feet of bush into the soil, over the root zone, which allows the shrubs to absorb the nutritional benefits.
Verdict: Unless you have a magnesium deficiency in your garden, there is no need to add Epsom salts. Doing so could even be harmful to soil, plants and water. Find out more about healthy soil and getting a soil test.
If you add Epsom salts to soil that already has sufficient magnesium, this can harm plants and contaminate soil. In addition, spraying Epsom salt solutions on plant leaves can also cause leaf scorch. Excess magnesium can also increase mineral contamination in water that percolates through soil.
If your plant's leaves are turning yellow, it might have a sulfate deficiency. If your plant's leaves are turning yellow but the veins remain green, it might have a magnesium deficiency. Epsom salts are a great solution for both of these problems.
If your soil becomes depleted of magnesium, adding Epsom salt will help and, since it poses little danger of overuse like most commercial fertilizers, you can use it safely on nearly all your garden plants.
Rodger suggests applying this solution to your plants every 2-4 weeks. The Epsom Salt Council also recommends using around 'two tablespoons per gallon of water' to feed house plants monthly. Meanwhile, you should use 'one tablespoon per nine square feet' on shrubs and evergreens every two to four weeks.
Magnesium deficiency
Symptoms: Yellowing between the leaf veins, sometimes with reddish brown tints and early leaf fall.
2. Fertilize your Succulents. Epsom salt works wonders as a fertilizer during the growing season and can help keep your succulents looking lush and beautiful for a long while. In addition, using an Epsom salt fertilizer is a great way to help encourage blooming in many succulents.
Prevent Fungal Disease
MAKE IT: Mix 1 teaspoon of baking soda and 2-3 drops of liquid soap in 1 liter of water. Spray the solution on the infected plants. Baking soda helps the plants become less acidic and prevents fungal growth.
For general garden start-up, mix one cup of Epsom salts per 100 square feet into soil before planting. To boost germination, mix one tablespoon of Epsom salts in a gallon of water and add to soil after seeding.
Perennials that do best with no supplement fertilizer include butterfly weed (Asclepias tuberosa), false indigo (Baptisia australis), asters, pinks (Dianthus spp.), rock roses (Helianthemum spp.), sea holly (Eryngium spp.), bee balm (Monarda didyma), speedwell (Veronica spp.), coneflowers (Echinacea spp.
“Magnesium and sulfur are essential nutrients.” Although magnesium and sulfur occur naturally in soil, they can be depleted by various conditions, including heavy agricultural use. But unlike most commercial fertilizers, which build up in the soil over time, Epsom Salt is not persistent so you can't overuse it.
Mix one tablespoon of Epsom Salts per quart of warm water.
People use Epsom salts baths as a home treatment for: Arthritis pain and swelling. Bruises and sprains. Fibromyalgia, a condition that makes your muscles, ligaments, and tendons hurt, and causes tender points throughout your body.
The shells also contain other minerals that help plants grow, including potassium, phosphorus, and magnesium. Eggshells are, therefore, an effective and inexpensive fertilizer for outdoor garden soil and houseplants.
Which plants shouldn't you try this with? Don't add eggshell fertilizer to plants that prefer acidic soil, like blueberries. Ericaceous plants such as mountain laurel, pieris and azaleas also fall into that category. In extreme cases, low acidity for plants could impact their overall health and/or the resulting crop.
Epsom salt contains relatively high levels of magnesium and sulfur. Although these are essential elements plants need, they are among many that contribute to growth and flowering or fruiting. Both elements aid in photosynthesis and help plants absorb the three macronutrients (nitrogen, phosphorus, and potassium).