If you're wondering how to farm Fiend Roses in Diablo 4 you'll need to Diablo 4 Gold set your sights on locations where The Helltide Rises across Sanctuary. If you've completed the campaign, you'll notice that the Diablo 4 map is besieged by something called the Diablo 4 Helltide – limited-time events which necessitate you slaying a hell of a lot of enemies. The rare roses can often be found growing in these areas, so keep an eye out for withering branches that are holding red roses, but there are a few other ways you can get them too:

Fiend Roses grow in Helltide areas.Fiend Roses can drop from enemies in Helltide areas.Fiend Roses can drop from Silent chests.Fiend Roses can drop from spawn from Tortured Gifts of Mystery Chests.
The Helltide locations aren't the only way that you can get your hands on the Fiend Rose in Diablo 4. There's a small chance that the Fiend Rose will spawn out of Silent Chests – although you'll need to use Diablo 4's Murmuring Obols to purchase more Whispering Keys if you want any chance of opening the rare chests.Additionally, you may get lucky and find that a Fiend Rose will drop from the Tortured Gifts of Mystery which are located throughout the Helltide zones, but you'll have to do some additional work to Diablo IV gold pry them open.