Fertilizing Beet Plants: Learn When And How To Fertilize Beets

beet soil
Image by AnnekeDeBlok

By Bonnie L. Grant

Beets are native to Mediterranean and some European regions. Both the root and the greens are high in vitamins and nutrients, and are delicious prepared a number of ways. Bigger, sweeter roots come from plants that are grown in highly fertile ground. Beet plant fertilizer should contain macro-nutrients, especially potassium, and micro-nutrients such as boron.

Beet Plant Fertilizer

Feeding beet plants is almost as important as soil tilth and water. Prepared beds should have organic matter worked into the soil to increase porosity and add nutrients, but beets are heavy feeders and will need supplemental nutrients during their growing period. The right combination of nutrients is important to knowing how to fertilize beets. The right kinds of nutrients mean bigger roots with sweeter flavor.


All plants need three major macro-nutrients: nitrogenpotassium and phosphorus.

  • Nitrogen drives the formation of leaves and is part of photosynthesis.
  • Potassium enhances fruit development and increases resistance to disease.
  • Phosphorus helps in the production of flowers and increases root growth and uptake.

Fertilizing beet plants with a high nitrogen fertilizer will result in leafy tops but minimal root development. However, beet plant fertilizer does need nitrogen to help leaves form, which in turn, provide solar energy in the form of carbohydrates. Carbohydrates are an essential part of the beet root formation. Beet feeding instructions must also include the proper amount of potassium and phosphorus for overall plant development.

How to Fertilize Beets

Proper soil pH must exist in soil in order for efficient nutrient uptake. Beets need a soil pH of 6.0 to 6.8 for optimum growth. The plants can tolerate a slighter higher pH, but no more than 7.0. is preferable. Perform a soil test to determine the status of pH levels prior to planting and tweak as necessary.

Broadcast fertilizer seven days before planting. Use 3 pounds of a 10-10-10 for fertilizing beet plants. Side-dress the plants one to three times with 3 ounces of the 10-10-10 formula. Higher rates are necessary in areas with more rainfall. Most regions have adequate potassium for large root production, but a soil test will reveal any deficiencies. In the event your soil has limited potassium, side-dress with a formula higher in potassium, which is the last number in the ratio.

Special Beet Feeding Instructions

Boron is necessary for feeding beet plants. Low levels of boron will cause black sunken spots on and in the root. Internal black spot can be prevented with ½ ounce of Borax per 100 square feet. Excess boron is damaging to some other food crops, so a soil test is necessary to indicate if Borax is needed.

Keep beet plants well supplied with moisture, especially at fertilization. This will help draw nutrients into the soil where the roots can utilize them. Cultivate shallowly around beet plants to prevent weeds and harvest beets when they are the size you require. Store beets in a cool location for several weeks or can or pickle them for even longer storage.

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