(Closer spacing yields smaller main heads, but more secondary heads.)įor those who wish to start sowing in pots, watch Ben in this video show you how it’s done! See the whole process from sowing to transplanting to broccoli care and harvesting.Ĭurled, misshapen/yellow leaves distorted flowers/fruit sticky “honeydew” (excrement) sooty, black mold. If you started seeds indoors, plant transplants that are 4 to 6 weeks old (and have 4 or 5 leaves) outdoors, 12 to 20 inches apart, in holes slightly deeper than their container depth.Once seedlings reach a height of& 2 to 3 inches, thin them so that plants are 12 to 20 inches apart.If starting seeds outdoors, sow seeds 1/2-inch deep and 3 inches apart.For fall plantings (best in warm climates), sow seeds outdoors 85 to 100 days before the first fall frost, when soil and ambient temperatures are high.Sow seeds outdoors 2 to 3 weeks before your last frost date, or as soon as the soil can be worked in the spring. Start seeds indoors 6 to 8 weeks before your last frost date.Consult our Planting Calendar to see recommended dates for your area. For spring plantings, broccoli may be started indoors or outdoors a few weeks ahead of your last spring frost date.Broccoli seeds are capable of germinating in soil temperatures as low as 40☏ (4☌), but warmer soil is preferred and will greatly speed up development.High temperatures will affect the development of the broccoli head (the harvestable part), so the goal is to get broccoli to mature before or after high temperatures are expected. Broccoli is a cool-season crop, so it should be started in early- to mid-spring (depending on your climate) for an early summer crop, or in mid- to late summer for a fall crop.The soil pH should ideally be slightly acidic, between 6.0 and 7.0. To increase fertility before you plant, in early spring, work in 2 to 4 inches of rich compost (humus) or a thin layer of manure. Plant in a bed of moist, fertile soil that drains well. Lack of sunlight may produce thin, leggy plants and subpar heads. Broccoli should be planted in a site that gets full sun (6 to 8 hours of sunlight per day).
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