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.
Potatoes are a considered to be a cool-season vegetable because they only actively produce a crop of potatoes when the soil temperature is between 60 to 70 degrees Fahrenheit. Once the soil temperature tops 80 degrees Fahrenheit, the tubers fail to grow. Potatoes can be grown in a wide range of soil conditions. Their ideal is a sandy loam. The soil should drain freely. If water accumulates, the plant will fail to produce adequate tubers and potato rot can easily occur. The potato plant prefers a soil pH of between 5.2 to 5.5.