Spinach is easy to grow indoors on your kitchen windowsill, as long as it doesn’t receive a lot of direct sunlight. Although planting the veggie indoors allows you to control its environment, spinach grows best in USDA planting zones 3-11.
How to grow spinach indoors. It is easy to grow spinach indoors on a windowsill. If planting in fall, place the pots on a sunnier windowsill as there are fewer hours of sunlight. Do not allow the plants to get too cold or too hot – so do not place directly above a radiator, for instance.
Spinach is a cool weather crop that requires six to eight hours of sunlight per day in order to grow. This can be easily remedied by supplying the young spinach plants with supplemental light and, according to Utah State University, fluorescent lights are the best choice for indoor gardening projects.
It takes about 45 days to grow spinach from seed to harvest. Some of the leaves may be large enough to pick before then, which is great. But make sure you don’t remove all of the leaves when you harvest.
Spinach is an annual crop. As an annual, each plant grows for a single season. New plants are grown from seed at the beginning of the growing season. Perennials, in contrast, die down to the soil line in fall and regrow from perennial roots each spring.
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.
Spinach can be grown from seed or starts. Plant your container grown spinach in pots that are 6-12 inches (15-30 cm.) across in soil amended with compost to aid in water retention and place in full sun. The soil pH should be around 6.0 to 7.0.
Spinach needs about one to one and a half inches of rain or irrigation per week. If you don’t get any rain, you will need to manually water your spinach plants. Instead of one long deep soak, spinach plants will do better with three or four light waterings per week.
The whole plant can be harvested at once, and cut at the base, or leaves may be picked off plants one layer at a time, giving inner layers more time to develop.
Spinach that has bolted. Once your favorite leaf lettuce or other leafy green has begun to bolt, the leaves turn bitter and can no longer be eaten. Instead of pulling out your bolting lettuce or other leafy greens, allow them to flower and form seeds.
Spinach will begin to flower as soon as spring days begin to lengthen. The response comes when days are longer than 14 hours and temperatures creep above 75 degrees F. Cool season varieties or broadleaf species will elongate, get taller, produce fewer leaves, and develop a flower head in warmer weather.
Just find the leaves that you want to harvest, hold each leaf with one hand and cut the stem with the other one. It’s that simple. Make sure to only harvest about 1/3 of each plant. Once you’ve harvested your spinach, all you need to do is water it and wait patiently for the next harvest.
Space plants 12 inches apart in rows 18 inches apart. Spinach. Grow 15 plants per person. Yield 4 to 7 pounds per 10-foot row.
Generally speaking, 200 square feet of garden space per person will allow for a harvest that feeds everyone year-round. For an average family of four, plan for an 800 square-foot garden—a plot that’s 20 feet by 40 feet in size should do the trick.
Most people seem to agree that for a conventional row garden (a row of corn, a row of lettuce, a row of tomatoes…) 100 square feet per person is needed for a fresh eating garden, and about 200 square feet per person if you want to can food for year round use.
To feed a family of four, start off by planting 40 potato plants.
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