6 Carolina Mantis Eggs Fresh for this Season! This bulk order of mantis eggs are great benefit for gardens and greenhouses. This deal is also a great choice for class projects! Things to keep in mind when hatching your egg case: If the egg dries out it will not hatch. If it is placed in direct sunlight and gets too hot it will not hatch. If it is kept too wet it will not hatch. If choosing to hatch these in containment, please keep in mind these will hatch out a lot of mantis so keep eggs separated or in a large enough habitat to house all the mantids!