The normal reason for doing it is when a strawberry is suspected of having a virus, but comes from a variety / cultivar that doesn't display symptoms well. read more
Grafting is a technique that vegetatively joins two plants into one. Instead of cross-pollinating two plants and producing a hybrid seed, grafted plants use the roots and the bottom portion of one plant (rootstock) and attach it to a tender shoot (scion) from the top portion of another plant. read more
You can't cross a tobacco plant with a tomato, you can't cross a monkey with a dog, and you can't cross a cannabis plant with a strawberry. With respect to hops, that plant is distantly related to cannabis, but its nowhere near close enough that a simple cross is possible. I've been told its possible to GRAFT a cannabis plant onto a hops vine, or vice versa. read more