Growing conditions for spinach


Growing Spinach, A Cool-Season Vegetable

Spinach (Spinacia oleracea) is a vitamin-rich, delicious, leafy green that is best grown in the cool weather of either spring or fall. The many varieties of spinach include smooth-leaf, savoy or curly leaf, arrowhead, and savory. It can be eaten raw or cooked. Spinach stores well in the refrigerator or can be blanched and frozen for later use. Spinach is versatile in the kitchen and packs a powerhouse of nutrients: iron; potassium; magnesium; vitamins A, B6, B9, C and E; and lutein.

Select a variety of spinach for growing and a garden area for planting. For best results, use fresh seeds as the germination rate for this crop deteriorates quickly. Always check the seed packet for specific varietal recommendations. A raised bed with good drainage is perfect for growing an early spring crop since the soil warms quickly and can be worked following just a few warm days. Spinach likes full sun but will tolerate partial shade. Prepare the planting bed by amending the soil with rich compost or aged manure. Mini-till or spade the ground and level it off with a rake. Mature spinach has a long taproot, so loosen the soil to between 12 and 18 inches. Sow the seeds ½ inch deep two inches apart, in rows 12 to 18 inches apart. If you are following intensive gardening plans, such as Mel Bartholomew's square foot gardening, plant 9 seeds per square foot. Make sure the soil is moist. You can grow spinach in a container, but choose varieties specifically suited to it, a container large enough for it, and a nutrient-rich soilless potting mix.

One key to successfully growing spinach is to plant the seeds when soil temperatures are cool. Spinach seeds germinate best in a soil temperature of 45⁰ F to 68⁰F. Recommendations are to plant spinach about four to eight weeks before your average last frost date in the spring and six to eight weeks before the average first frost date in the fall. Two crops per year can be achieved!  Many home gardeners have become discouraged growing spinach because they start too late in the spring. Understanding the relationship of spinach to temperature is critical to achieving success.

When planting in early spring, shelter the seeds with a clear polypropylene cover over the raised bed for the first few weeks. A framework over the bed keeps the plastic from direct contact with the spinach and prevents stem damage if snow, rain or ice builds up on the plastic cover. The plastic cover serves as a greenhouse, encouraging leaf growth on those early spring days.

Within 7 to 10 days, the first signs of sprouting usually appear as the cotyledon (seed leaves) emerge. During light rainy days, remove the plastic cover for a good soaking. Keep the cover on until the weather warms. Optimum growing temperature is 50⁰ F to 60⁰ F, but young seedlings can tolerate temperatures as low as 15⁰ F to 20⁰ F. Try to keep the soil consistently moist because spinach will bolt if the soil dries out. When spinach bolts, it sends up a strong central stem to produce seed, and it becomes bitter and inedible. When you must supplement with irrigation, water the soil, not the plant leaves. Moisture on the leaves can encourage fungal diseases.

Thin out the plants as they reach two inches in height. Spinach plants need four to six inches of space to develop properly. Again, check the seed packet for specific varietal recommendations. Failure to thin out seedlings can result in stunted growth and premature bolting. Better spacing also decreases the plant's susceptibility to disease and pests. Roots are shallow at this stage, so be careful when thinning. Gently pull out all weeds when they are small so as not to disturb the spinach roots. Aphids and leaf miners are typical pests and removing weeds can help control the population.

Mulching the young plants will help keep the soil moist and cool and will also discourage weeds.

As daylight increases and temperatures warm to 70⁰F, cover with a shade cloth. This floating row cover will help cool the soil as well as control insects.

Begin harvesting the spinach leaves when they reach a nice size. Leaves can become bitter and lose quality if left on the stem too long. Simply snip off the outer leaves at their base, leaving the main stem or rosette intact for further growth.

Once the days warm up and the temperature reaches the 80⁰F, spinach will want to bolt. Therefore, with a spring planting, this plant's productive life usually stops by the end of May. Spinach is also day-length sensitive. It will bolt in June even if the temperatures are cool. Pull out the plants and add them to your compost pile. Amend the soil with compost and reuse the bed for the next warm-season vegetable crop, such as beans or peppers.

For a fall crop, use the same season-extending methods as described above – only in reverse. Shade cloth can keep the soil cool during the early warmer days of fall. Plastic covers can keep the growing area warm enough to be able to harvest a crop into late fall or, with luck, early winter.

By understanding the growing requirements of spinach, you can be successful with two abundant crops each year. Enjoy your fresh picked, crisp leaf spinach in salads and cooked dishes. Visit Cut Cancer Risks with Spinach for recipes using spinach.

Spinach Planting & Spinach Growing

Spinach is a fast-growing plant, yielding many leaves in a short time in the mild weather of spring and fall. Get expert tips for growing spinach.

Spinach is a cool-weather vegetable related to beets and Swiss chard. A fast-growing plant, it yields many leaves in a short time in the mild weather of spring and fall. When growing spinach, the trick lies in making it last as long as possible, especially in the spring, when lengthening days shorten its life. One great way to do that is to start with vigorous young Bonnie Plants® spinach plants, which are already well on their way to maturity when you put them in your garden. Although it prefers full sun, spinach will still produce a respectable harvest in partial shade.

Quick Guide to Growing Spinach

Soil, Planting, and Care

Spinach grows most quickly in well-drained soil rich in organic matter such as compost or composted manure and with a pH of 6.5 to 7. A simple way to improve your existing soil is to mix 3 inches of aged compost-enriched Miracle-Gro® Performance Organics® All Purpose In-Ground Soil with the top 6 inches of existing soil. In order to grow spinach twice a year, plant it about 4 to 6 weeks before the last frost in the spring, and again 6 to 8 weeks before the first frost in the fall. Space plants 12 inches apart; this gives leaves room to reach full size. Perhaps the easiest growing option is to plant spinach in pots filled with premium quality potting mix, such as Miracle-Gro® Performance Organics® All Purpose Container Mix which will provide roots with just the right environment for strong growth.

For the most tender leaves, encourage spinach to grow fast and without interruption by fertilizing regularly with a water-soluble fertilizer like Miracle-Gro® Performance Organics® Edibles Plant Nutrition that feeds the soil along with the plants for better growth. (Be sure to follow directions.) This plant food works in tandem with great soil to help you achieve the best possible spinach harvest.

In the spring, plants will grow tall and bloom (called bolting) as soon as the days are longer than 14 hours. Heat also speeds up bolting, since spinach prefers temperatures between 35 and 75 degrees. Our variety is slow to bolt, which is a real bonus for gardeners who don't have the luxury of long stretches of mild weather.

Because it bolts in the lengthening days of spring, spinach is an especially popular crop for fall, when days are short and cool. Plants are very cold-hardy, tolerating temperatures as cold as the teens to low 20s once they are well established. This quality makes them great for overwintering over in zones 8 and southward.

In cold climates, some gardeners plant spinach in a cold frame or cover plants with hay and leave them all winter; they'll be first to produce a very early spring harvest.

Troubleshooting

Heat and long days will end your crop, so plant as mentioned above. Pests that enjoy spinach include flea beetles, spider mites, and aphids, which feed on the leaves. Diseases that attack plants are downy mildew (a mildew that may appear during cool, moist weather) and white rust (which causes white spots on the leaves). For instructions on how to fight back against these pests and diseases, contact your local Extension agency.

Harvest and Storage

Spinach leaves are ready to harvest as soon as they are big enough to eat. Harvest by removing only the outer leaves and allowing the center leaves to grow larger; this will allow the plant to keep producing. Picking the outer leaves also gives the advantage of briefly delaying bolting. In spring, when plants are about to bolt, pull the entire plant at once to enjoy the leaves before they become bitter.

A bowl planter filled with spinach plants makes a great small cool-season garden. Spinach is one of the most cold tolerant vegetable plants.When spinach begins to bolt in warm weather, it tastes bitter and is ready to be pulled. The plants look tall and spindly with thick stalks when they start flowering.These spinach plants grow close together so that they can be thinned as they are harvested.

FAQs

When is the best time to plant spinach?

In late winter or early spring for a fast crop and again in late summer or early fall, after the hottest temperatures have passed. Spinach is a cool-weather vegetable.

How can I know when my spinach is ready for harvest? What is the method of harvesting?

When the outer leaves are about 6 inches long, they're ready to be harvested. Or, if it is spring and plants are near the end of the season where they will soon bolt (bloom), you can pull up or cut the entire plant.

My spinach bolted, and I cut the plants just above the soil line. Will I get another crop from them?

No, they are finished. It is time to pull them up and replace them with a warm-weather crop. You can plant spinach again in late summer for a fall harvest.

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Author: Elena N. https://floristics.info/en/index.php?option=com_contact&view=contact&id=19 Category: garden plants reprinted: Last amendments:

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