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Best Soil for Growing Spinach

Choosing the best possible soil for spinach will help improve the flavor and quality of your vegetables. Spinach soil requires a specific pH range and must be rich in macronutrients, most important of which is nitrogen. This article is designed to help gardeners achieve the best soil for growing spinach.

Optimum Soil Conditions for Spinach

Soil Type

Loam or sandy loam

pH Range

6.2 to 6.9

Nutrients

High Nitrogen Levels Required

Soil pH Range for Spinach

Maintaining the correct pH range, which measures soil acidity/alkalinity, is essential to growing great tasting spinach plants. It is crucial that the pH range is within 6.2 to 6.8. Any more acidic or alkaline and your plants many fail to grow effectively. Spinach is especially sensitive to acidic soils, so make sure that the pH does NOT exceed 6.2.

How to Adjust the Soil pH

Raising Soil pH for Spinach: The most common way to raise the pH level of soil is to add limestone, a process known as liming. There are 4 types of limestone to choose from, which include pulverized, granular, pelletized and hydrated. The finer the limestone particles, the more effective it is at raising pH. Always test your soil first to determine how much liming material will be needed.

Lowering Soil pH for Spinach: Gardeners typically use either Sulfur or Aluminum sulfate to increase acidity in soil. Sulfur will take several weeks in optimum before you start to see changes in the pH because it requires a bacterial breakdown to occur.  If you require instant changes to the soil pH, aluminum sulfate may be a better choice because it will change pH as soon as it is dissolved in the soil. You can find either of these materials at your local home improvement store or garden center.

Soil Nutrients for Growing Spinach

Spinach requires high levels of nitrogen to grow successfully. You can achieve the optimum soil fertility by adding a high nitrogen fertilizer into the soil prior to seeding. The dark green nutrient rich spinach leaves require the nitrogen to achieve optimum taste and color. If the spinach leaves are becoming brown or yellow, this may be a sign of a nitrogen deficiency. Make sure to test the soil to determine the exact nutrient content of the soil.

Check out the full spinach growing guide.

Learn more about soil basics.