蜜桃恋人

How to Grow Spinach Plants: The Complete Guide

Photo Credit
samotrebizan/Getty Images
Botanical Name
Spinacia oleracea
Plant Type
Vegetable
Sun Exposure
Full Sun
Soil pH
Neutral

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Planting, Growing, and Harvesting Spinach

Catherine Boeckmann

Spinach, a super鈥揷old-hardy leafy green, is a popular crop that thrives in fall and even winter in some areas. It can also be planted in very early spring. Learn more about planting, growing, and harvesting nutritious spinach in your home garden.

About Spinach

Spinach has similar cool-season growing conditions and requirements as lettuce, but it is more versatile in both its nutrition and its ability to be eaten raw or cooked. It is higher in iron, calcium, and vitamins than most cultivated greens and is one of the best sources of vitamins A, B, and C.

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Planting

Spinach tolerates full sun to light shade; prepare soil about a week before planting by mixing in compost. Alternatively, prepare the soil in late summer or early fall, when spinach can also be sown where winters are mild.

When to Plant Spinach

  • Spinach requires 6 weeks of cool weather from seeding to harvest; this generally spring or fall, though many gardeners have better luck in the fall.
  • Although seeds can be started indoors, it is not recommended, as seedlings are difficult to transplant.
  • In the fall, sow seeds when the soil is 70掳F or cooler. See our fall planting calendar.
  • Many gardeners can grow spinach throughout the winter if they protect the young plants with a cold frame or thick mulch, then remove the protection when soil temperature in your area reaches 40潞F in spring. Remove the mulch to harvest some spinach, then replace the mulch.
  • If planting in the early spring, sow seeds as soon as the ground warms to 40掳F. (Cover the soil with black plastic to speed its warming.)
  • To distract leaf miners, sow spinach seeds and radish seeds in alternate rows. Leaf miner damage to radish tops does not affect their root growth.
  • Common spinach cannot grow in midsummer as it’s not cool enough. (For a summer harvest, try New Zealand Spinach or Malabar Spinach, two similar leafy greens that are more heat tolerant.)

How to Plant Spinach

  • Sow seeds 1/2 of an inch deep every 2 inches and cover with 1/2 inch of soil.
  • Plant in rows 12 to 18 inches apart or sprinkle over a wide row or bed.
  • Sow every couple of weeks during early spring for a continuous harvest.

Growing

  • Water spinach to keep soil constantly moist.
  • Use row covers to maintain cool soil and deter pests.
  • When seedlings sprout to about 2 inches, thin them to 3-4 inches apart. You can eat the thinnings.
  • Beyond thinning, no cultivation is necessary. Roots are shallow and easily damaged.
  • Water regularly and mulch to retain moisture.
  • When plants reach one-third of their growth, side-dress with a high-nitrogen fertilizer, as needed. Nutrient deficiencies may appear as yellow or pale leaves, stunted or distorted growth, a purpling or bronzing of leaves, leaves dropping early, or other symptoms.
  • In early spring and late fall: Spinach can tolerate the cold; it can survive a frost and temps down to 15潞F (-9掳C). (See local frost dates) Young spinach is more tender; cover if cold temps are in the forecast.

Types

There are four main types of spinach suited for spring and fall plantings.

  • Baby-leaf style spinach is tender, with small-size leaves. The variety 鈥楤aby’s Leaf鈥 is good for containers; 鈥楥atalina鈥 is heat-tolerant and resistant to downy mildew.
  • Savoy spinach has curly, crinkled, dark-green leaves, e.g. 鈥楤loomsdale.鈥 The 鈥榃inter Bloomsdale鈥 variety is a crinkled-leaf, fall variety, tolerant to mosaic viruses.
  • Semi-Savoy has slightly crinkled leaves and can be difficult to seed. 鈥楳elody鈥 is resistant to cucumber mosaic virus and downy mildew; mildew-resistant 鈥楻emington鈥 will grow in spring, summer, or fall; 鈥楾yee鈥 can be planted in spring or fall, and is resistant to downy mildew.
  • Smooth- or flat-leaf (also called plain leaf) varieties have spade-shape leaves. 鈥楪iant Nobel鈥 is a plain leaf variety and an heirloom that is slow to bolt; 鈥楴ordic IV鈥 is bolt-resistant.
  • Malabar Spinach (Basella alba), a vine, and New Zealand Spinach (Tetragonia tetragonioides), a perennial, are two heat-tolerant leafy greens that resemble common spinach; both are heat-tolerant. Grow them in the summer, when common spinach can’t take the heat.

Harvesting

  • Harvest a few outer leaves from each plant (so that inner leaves can develop) when leaves reach the desired size, or harvest the entire plant, cutting the stem at the base.
  • Don鈥檛 wait too long to harvest or wait for larger leaves. Bitterness will set in quickly after maturity. Be aware of day length and heat: Increasing daylight (about 14 hours or longer) and warmer seasonal temperatures can cause spinach to bolt (develop a large stalk with narrower leaves and buds/flowers/seeds), which makes the leaf taste bitter. 
  • If spinach starts to bolt, pull the plant and use the leaves. Or try to slow the bolting: Pinch off the flower/seed heads, keep the soil moist, and provide shade.
Spinach. Photo by Deyan Georgiev/Shutterstock
Harvesting spinach. 
Photo by Deyan Georgiev/Shutterstock.

How to Store Spinach

Fresh spinach leaves are good for up to a week. Too much moisture hastens its demise. So store fresh spinach unwashed and don鈥檛 wash until ready to use. Pat dry with a paper towel and put in a freezer bag with the towel to absorb moisture.

Given its short shelf life, spinach is perfect for freezing. Wash, trim off ends and yellowing leaves, blanch, and pack into freezer bags. See how to freeze spinach.

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Wit and Wisdom

  • Phenology, the study of signs, suggests planting spinach when crocuses are blooming.
  • Similarly, in areas where lilacs grow, old-time farmers say to plant spinach when lilacs are in first leaf.
  • Scatter spinach or lettuce seeds around emerging bulb foliage to make wise use of your garden space, and have a leafy green crop at the ready to cover the bare spots left by deadheaded spring flowers.

Pests/Diseases

Spinach Pests and Diseases
Pest/DiseaseTypeSymptomsControl/Prevention
AphidsInsectMisshapen/yellow leaves; sticky 鈥渉oneydew鈥 (excrement); sooty, black moldGrow companion plants; knock off with water spray; apply insecticidal soap; put banana or orange peels around plants; wipe leaves with a 1 to 2 percent solution of dish soap (no additives) and water every 2 to 3 days for 2 weeks; add native plants to invite beneficial insects
Downy mildewFungusYellow, angular spots on upper leaf surfaces that turn brown; white/purple/gray cottony growth on leaf undersides only; distorted leaves; defoliationRemove plant debris; choose resistant varieties; ensure good air circulation; avoid overhead watering
Leaf minersInsectMeandering blisters in leaves caused by tunneling larvaeRemove infested leaves, weed diligently; use row covers; till soil early in season; rotate crops
Leaf spot (Cercospora)FungusMany small brown spots with red-purple halos on leaves that enlarge and turn gray; centers of spots eventually fall out, leaving the halosDestroy infected plants; weed; avoid overhead watering; ensure good air circulation; rotate crops
Spinach blight (mosaic virus)VirusVaries with plant, but may include stunting, mottled green/yellow/white pattern or ringed spots on leaves; distorted leaf growthDestroy infected plants; choose resistant varieties and certified virus-free seed; use row covers; disinfect tools; weed; control aphids; use mulch
White rustFungusChalk-white blisters mainly on leaf undersides; small, yellow-green spots or blisters, sometimes in circular arrangement, on upper leaf surfaces; possible distortion or galls; stems may also be infectedDestroy infected plants; choose resistant varieties; weed; destroy crop residue; rotate crops

Recipes

Pasta Salad With Spinach and Artichokes
Spinach-Stuffed Tomatoes
Chicken Spinach Salad with Oranges, Dates, and Goat Cheese
Spinach Lasagna
Spinach and Cheese鈥揝tuffed Chicken Breasts

Cooking Notes

  • A pinch of baking soda in the cooking water keeps the spinach greener.
  • Refresh wilted spinach by placing it in a bowl of ice water for a few minutes before using it.
  • Spinach boosts your brainpower, but it can hinder iron absorption. For better absorption of iron, eat spinach with orange slices.
  • Raw, young spinach is best in salads and smoothies; more mature spinach is excellent saut茅ed in heated olive oil.
  • Embrace your leafy greens! Learn more about the health benefits of going green!
Vegetables
About The Author

Catherine Boeckmann

Catherine Boeckmann loves nature, stargazing, and gardening so it鈥檚 not surprising that she and The Old Farmer鈥檚 蜜桃恋人 found each other. She leads digital content for the 蜜桃恋人 website, and is also a certified master gardener in the state of Indiana. Read More from Catherine Boeckmann
 

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Comments

Amanda In SoFLa (not verified)

10 years 4 months ago

Also. I was looking to use gutters to create the rows. Is this a good idea and healthy? Just seems to make sense.
TY again.

I live in Oklahoma and i'm running a similar system. I used four 4' lengths of gutter on a 6'x 50" wood frame. I also found it difficult to water after 2 weeks of growth so i ran a length of schedule 40 pvc along the back of the gutter for easier watering. I've been growing black seeded simpson well in my indoor rack and simpson select on my outdoor rack.

Clobsmom (not verified)

10 years 4 months ago

I started a garden this year for the first time ever. Normally if it doesn't 'meow' I have no idea how to keep it alive.. But my garden is doing beautifully. My spinach was planted a few days after the last snowfall (which in Calgary, AB is late May)I have been harvesting steadily as I need the spinach, but now I have leaf miners. I've been removing the leaves that have been affected and am careful to clean each leaf before feeding it to my family but now a few plants are bolting and I was wondering if I should harvest the whole crop. And if I do will this kill off the leafminers before I try and plant a new crop in the fall? Any advise is appreciated..

I would harvest the entire crop. If one spinach had started to bolt, it is likely because of the heat. Here in Southern California, my spinach bolted in March. If one has started to bolt, the rest will follow shortly after. If you wait, they will be too bitter to eat

Catherine Cullinan (not verified)

10 years 5 months ago

I sowed my spinach Viking from seeds in the ground in March, they are still small plants. It's my first time sowing spinach so I don't know when to pick them.

Spinach does not like hot weather, so hopefully you have your plants in the shade. Harvest the leaves when they reach desired size. Don鈥檛 wait too long to harvest, or wait for larger leaves; bitterness will set in quickly after maturity. The whole plant can be harvested at once, and cut at the base, or leaves may be picked off the plants one layer at a time, giving inner layers more time to develop.

Roy Goodall (not verified)

10 years 5 months ago

I planted some spinach last year and had a wonderful crop. I left it in and this year it is about 7 foot tall, is this a record?

Perhaps what you had was Gynura Procumbus? Also known as 鈥淟ongevity Spinach 鈥 :)

Roy, I don't think this was spinach unless it was born in a fictional land for Popeye the Sailor! The height for most varieties is 10 to 12 inches.

Jen12345 (not verified)

10 years 6 months ago

I had bought 4 spinach seedlings from a grocery store in a 4-pack, which were each about as tall as my finger. I planted them in pots on my porch in early May. They are all healthy and fully green. However, almost every leaf on every plant is arrow-shaped (and has been since I got them) and stalks with buds on them are growing, and they got much taller within only a few days. A search online tells me that this means they are about to become bitter, seed, and die. Right now the leaves are green and not very bitter. My question is, if I bring the spinach pots indoors, can I still save the plants and get them to produce big, edible leaves over the summer? Or is it already too late to do that?