Stingberry Bushes are naturally occurring blocks in the Nether that spawn Stingberries.
The Stingberry Bush is an easily transportable block. As the name implies, they give you Stingberries. To obtain said Stingberries, simply left or right click to get them. The Stingberries can be easily seen on the full-size (grown) bushes, as they appear as purple dots. You can only harvest them when you see the Stingberries on it.
You can use bonemeal on the bush to make it grow through the stages, as well as produce another bush on top once that bush is fully grown.