Fertilize lightly every 2 to 3 weeks with balanced fertilizer for spinach
If your spinach plants are growing slowly, you may want to add more nitrogen-based fertilizer.
Fertilize with compost tea or fish emulsion when the plants have four true leaves
Spinach likes organic matter such as well-rotted manure, alfalfa meal, soybean meal, cottonseed meal, and blood meal.
Add the fertilizer according to label recommendations and water thoroughly.
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