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.
Tomatoes are a warm-season annual that grow best when the soil temperature is at least 55Â°F and the air temperature ranges between 65Â° and 90Â°F. Tomatoes require from 50 to more than 90 warm, frost-free days to reach harvest.Tomatoes are commonly grown from seedlings started indoors and transplanted into the garden.row young seedlings on at 60Â° to 70Â°F; allow a gentle breeze to rustle over young seedlings each day so that they grow strong stems. About four weeks after germination, about two weeks after potting up seedlings the first time, pot them up again to 4-inch pots.