if you ever get tired of a plant, simply plant her somewhere in the wild(like 50yds off the road), or better yet make clones from all her branches and plant those.
Overgrow ftw
Well I keep them forever if they are good, I instantly eliminate shitty strains upon discovery lol - if they yield 2 gram per watt, finish fast, vigorous, stay healthy easily, and taste good they are pretty much a keeper for life for me. I got about 12 or so strains currently.
Lets see Wembley, SLH, Citrus, Jilly Bean, Northern Lights, Power Kush, Vanilla Kush, Master Kush, Cheese, Lemon Skunk, White Siberian, AK47, Blueberry, Skunk#1, BlueberryXNorthern Lights.....think thats it for keepers.