I had so much fun reading How to Grow Ginger by Leigh Tate. But before I dive into my review, I have to include an important caveat. Reading this book doesn't necessarily mean your mothers-in-law will gift you with a five month old ginger plant so you can experiment immediately...even though it totally did for me. (Thank you so much, Rose Nell and Jayne!)
Ahem, back to the point. I'd seen fresh ginger for sale at our local farmer's market, but I hadn't taken the time to figure out whether it was worth growing ourselves. The short answer: very worthwhile because the process is crazy easy. Basically, you put a store-bought ginger root in a big pot a bit after your frost-free date, keep the plant in partial shade and topdress with compost once a month, then harvest after the leaves die back in the autumn.
Or you can start harvesting earlier, the way I did. Each of the stems in your pot leads down to a single ginger root and if you have strong hands you can tear out a root the way you'd grub out new potatoes. I pulled out two roots and made pickled ginger (so easy and so delectable!) and lacto-fermented ginger (still in the works). I'm also looking forward to making candied ginger with honey for a family member who loves the treat but prefers to dine sugar-free.
If those experiments don't sound like fun, Tate also includes recipes for dehydrating ginger and turning it into the powder you put into cookies and cakes, plus a primer on making a ginger drink. I particularly enjoyed her section about peeling. Upshot: you don't have to peel if you're like me and prefer to leave skins on.
To cut a long story short, if you're interested in growing ginger you might as well jumpstart your process by checking out this excellent guide. Like everything else you grow yourself, fresh ginger out of your yard just tastes better than any you can buy!