I've been growing them a lot lately because my Glitch's brain is overloaded with skills (from before Brain Capacity was even an issue). So they help in learning new skills that take way more time now to learn. I'll probably need a bigger herb garden soon o__o
They grow in batches of three (plus bonuses of 6) which helps when making tinctures to donate. It's my prime donation material since I can make around a hundred per harvest, i have 90 plots in my backyard.
A pest?! No way! I agree it takes up plots for a longer period of time, but when I come upon a street that has a big garden overflowing with fully grown YC? I am one happy Glitch. I harvest the bejesus out of that stuff and plant more for the next person who will come along 8 hours later and will hopefully experience the same happiness!