induration. 1. the process of hardening or being hardened.
1 They're weak against the Ice and Water types in reference of erosion, which cause this elements to the ground. 2  They're immune against the Electric type because in real life, the ground is a natural sink of electrons.  The Bug type resists them because many bugs like worms live inside the ground and many of them eat it.
If you want to test a plantâs toughness, try growing it in the strip between the sidewalk and the street. Thatâs where Iâm using creeping raspberry as a ground cover. So far, itâs proved itself a worthy roadside warrior in my yard, where it has managed to survive abuse from both two-legged and four-legged creatures.