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Kentucky State University Cooperative Extension Connections

Spinach (Spinacia Oleracea)

Megrael Ngudia, Undergraduate Research Assistant Marie Merci Uwimbabazi, Graduate Research Assistant Cora Teets, M.S., Research & Extension Associate for Sustainable Agriculture & Food Systems Theoneste Nzaramyimana, Ph.D., Assistant Professor for Urban Agriculture

Introduction and Background

Spinach (Spinacia oleracea L.) is an annual leafy green vegetable belonging to the Amaranthaceae family and is believed to have originated from ancient Persia (University of Missouri, 2020).
There are three main spinach types: flat leaf, savoy, and semi-savoy spinach (Colorado State University Extension, 2025).
Spinach became popular in North America during the 20th century and was associated with strength through the Popeye cartoon character (University of Missouri, 2020). Spinach is rich in vitamins, minerals, and antioxidants and can be eaten raw or cooked in many dishes (Cleveland Clinic & AHA, 2024).
In 2024, spinach production in the United States totaled approximately 617 million pounds with a crop value of about $545 million (USDA-NASS, 2025)

Growing Spinach in Kentucky

Spinach grows best in cool temperatures between 50–60°F (UK, 2021).
Plant spinach during spring or fall in fertile, well-drained soil with a pH of 6.5–7.0 (UK, 2021).
Spinach can be grown in pots, raised beds, or open fields with full sunlight to partial shade.
Mixing aged compost or organic matter into the soil improves growth (UK, 2021)

Images credits: Agribotix, https://agribotix.com/how-to-harvest-spinach/

Care and Maintainance

Keep soil evenly moist but not soggy by watering frequently (UK, 2021).
Use water-soluble fertilizers such as fish fertilizer for healthy growth (UK, 2021). Baby spinach can be harvested in 4–6 weeks, while mature leaves are ready in 6–8 weeks (UK, 2021; SSE, 2025).
Spinach can be stored in the refrigerator for up to 10 days under ideal conditions (SSE, 2025).

Harvest and Storage

Harvest can begin as early as 4 to 6 weeks for baby spinach (young leaves), and 6 to 8 weeks for mature leaves (UK, 2021 & SSE, 2025).
Harvest spinach by obtaining the outermost leaves once they are large enough to eat (SSE, 2025).
Spinach can be stored in colder areas of the fridge for up to 10 days for ideal condition (SSE, 2025).
Avoid storing spinach near ethylene-producing fruits like apples, as this accelerates spoilage.

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Nutritional Benefits

Add Spinach to Your Healthy Diet

Spinach is rich in vitamins A, C, K1, and B9 (folate), as well as minerals such as iron and calcium (Cleveland Clinic & AHA, 2024).
Sauté: fresh spinach with garlic, onions, and olive oil.
Bake: spinach, artichoke hearts, mayonnaise, parmesan cheese, and monterey jack cheese together for a classic spinach artichoke dip.
It contains antioxidants such as lutein and zeaxanthin (Cleveland Clinic, 2024).
Blend: spinach with fruits; strawberries, pineapple, banana, and chia seeds to make a delicious smoothie.
Spinach is low in calories and high in fiber (AHA, 2024).
Fold: spinach, red bell peppers, and hummus together on a whole-wheat flatbread for a healthy, filling snack.

Health Benefits

Toss: spinach, feta, toasted almonds, red onions, and apples to make a classic spinach salad. Dress with a mustard vinaigrette.

Image1 credit: Panlasang Pinoy, https://panlasangpinoy.com/garlic-sesame-spinach-recipe/ Image2 credit: Veggie World Recipes, https://veggieworldrecipes.com/cauliflower-spinach-green-smoothie/

Improved eye health: Vitamin A and beta-carotene lower risks of eye disorders (Cleveland Clinic, 2024).
Cancer prevention: Antioxidants minimize the damaging effects of free radicals, thus may reduce the effects of cancer disease (NFCR, 2024).
Lowered blood pressure levels: Spinach is high in magnesium, folate and a B Vitamin that create nitric oxide which is known to help lower blood pressure (Cleveland Clinic, 2024).
Skin health and immune function: Vitamin C builds strong skin, repairs tissue and supports a responsive and protected immune system (Oregon State University, 2025).
Supports healthy blood: Eating an iron-rich diet that includes spinach can help prevent iron-deficiency known as anemia (AHA, 2024).

Image credit: NFCR https://www.nfcr.org/blog/spinach-a-superpower-against-colon-cancer/

Acknowledgments

We thank Ms. Nicole Daniels, Mr. Jody Thompson, and Ms. Kara Back-Campbell for their time and review of this publication. We acknowledge the USDA Evans-Allen Project #7004987 for support of this research.

Sources

American Heart Association (AHA). (2024). Among Leafy Green Powerhouses, Spinach Packs a Wallop. Cleveland Clinic Health Essentials. (2024). 7 Reasons You Should Eat More Spinach. https://www.heart.org/en/news/2024/03/25/among-leafy-green-powerhouses-spinach-packs-a-wallop
Colorado State University Extension. (2025). Colorado Spinach. https://extension.colostate.edu/resource/colorado-spinach-2/
Oregon State University. (2025). Food Hero Spinach. https://foodhero.org/spinach
National Foundation for Cancer Research (NFCR). (2024). Spinach: A Superpower Against Colon Cancer. https://www.nfcr.org/blog/spinach-a-superpower-against-colon-cancer/
Seed Savers Exchange (SSE). (2025). Growing Guide: Spinach.https://seedsavers.org/grow-spinach/
University of Kentucky Cooperative Extension Service. (2021). Home Vegetable Gardening in Kentucky (ID-128)