Spinach Plants and Spinach Seeds Minimum soil temperature 32 ° F Seeds and Plants Lima Bean Plant and Seeds Minimum soil temperature 70° F Pea Plants and Pea Seeds Minimum soil temperature 40° F Broccoli and Broccoli Seeds Minimum soil temperature 40° F Squash and Squash Seeds Minimum soil temperature 60° F Cucumber and Cucumber Seeds Minimum soil temperature 60° F Radishes and Radish Seeds Minimum soil temperature 40°F Corn Plants and Corn Seeds Minimum soil temperature 50° F Spinach Plants and Spinach Seeds Minimum soil temperature 32 ° F _____ = 1 cm _____ = 1 cm