You Will Get 5 Seeds Euphorbia Lathyris Gopher Purge Perennial. The most amazing characteristic of this plant is that it has the ability to keep rodents away from areas that you do not want them in.. The roots of this plant exude a sap that is a mild irritant to the rodents as they borrow in the vacinity of the plants and therefore, the little critters usually find a different home It is a beautiful perennial that gets clusters of unique greenish yellow flowers and great blue green foliage.. These unique plants are hardy to USDA zone 4, possibly colder, and they grow best in full sun to part shade.. They would make excellent additions to your rare plant collection, or just make a unique statement in your yard.