[header] How to grow and harvest glass gem corn [title] Plant the corn in the spring. [step] You want to wait until you're into the spring season to plant your corn. Corn is very susceptible to frost. 
The soil should be at least 60 degrees fahrenheit (16 degrees celsius) before you plant your corn. [substeps] To measure the temperature of the soil, buy a soil thermometer at a local greenhouse or online.