I have been experimenting with a one gallon batch of Nettles & Ginger wine, when it came time to rack it off the lees, the ginger taste wasn't as strong as I'd like.
What I did was to thinly shave about 5 oz fresh ginger root(I probably used about 13oz total, I really like ginger) and boiled it with some water, making a ginger tea. I added the ginger to my new secondary, then racked the wine into it, then used the ginger tea to top up the secondary. After a week, I racked the wine off of the ginger to a jug to age.
Not sure if it's the best way to add more ginger flavor, but it seemed to work for me.
On Deck - Juneberry Wine, Mulberry Mead, Lilac Wine, Blackberry & Dandelion Wine
Primary -Lappish Hag's Love Potion, Frozen Strawberry Wine, Dandelion Mead
Secondary - Dandelion Wine, Ginger & Nettles Wine, JAOM
Newly Bottled - Mulberry Wine, Juneberry Wine