QUESTION: Why are my Brussels sprouts not forming? Do I need to fertilize my Brussels sprout plants? -Gerry C
ANSWER: Brussels sprouts need very fertile soil to perform well. Therefore, ample amounts of fertilizer applied one third before and two thirds after planting are needed for best results. Adding plenty of organic matter can replace half of the fertilizer requirements.
Brussels sprouts are much more tolerant of drought than some garden veggies but they do require moist soil in summer in order to produce optimal sprouts. Plants should also be allowed at least two feet of growing room between plants and rows, and allowing three feet between rows for easier access when harvesting. Brussels sprouts require watering every 14 days in dry spells, and need an even and consistently moist soil during their growing season, especially when developing sprouts.
If your plants are not producing many sprouts, you might want to look into a lack of nitrogen in your soil. The number of sprouts is directly dependent on the number of leaves that the plant produces. For plenty of leaves early sowing (late winter or early spring) is essential and careful planting into very fertile soil and careful attention to moisture levels in the soil will help immensely.