The exception is one study in the Netherlandsâthe Netherlands Cohort Study on Diet and Cancerâin which women (but not men) who had a high intake of cruciferous vegetables had a reduced risk of colon (but not rectal) cancer (12).
Crops: beans, celery, corn, cucumbers, New Zealand spinach, and summer squash. Temperatures: Tender vegetables grow with daytime temperatures above 55Â°F, and are intolerant of frost. When to plant: 1  Based on soil temperature, refer to Table 2.2  Soil is adequately dry to work.3  These crops may be planted (from seed) around the date of the average last spring frost.emperatures: Very tender vegetables are not only intolerant of frost, but also cool spring winds. They need daytime temperatures above 60Â°F, and prefer temperatures of 70Â°F to 95Â°F. A week of daytime temperatures below 55Â°F may stunt the crop.
Carrot. Planting: Carrots (Daucus carota) are cool-season plants that grow best at average temperatures between 60 and 65 Â°F. The optimum soil temperature for seed germination is 55 to 75 Â°F. Seeds will not germinate above 95 Â°F.lant radish seed in rows 12 to 24 inches apart and place the seed Â½-inch deep with about 1 inch between seeds. Radish can be broadcast-seeded in a 12-inch bed and then thinned when plants are in the one to two true leaf stage.