Blight
A creature that you can see within range makes a Constitution saving throw, taking 8d8 Necrotic damage on a failed save or half as much damage on a successful one. A Plant creature automatically fails the save.
Alternatively, target a nonmagical plant that isn't a creature, such as a tree or shrub. It doesn't make a save; it simply withers and dies.
Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 4.
Blight 5e 2024 vs. 2014 edition differences
The 2024 version specifies that a Plant creature automatically fails the save, whereas the 2014 version makes it with disadvantage and deals maximum damage. The 2024 version explicitly states nonmagical plants don't make saves and die, while the 2014 version states they don't make saves and wither. Damage increase wording is simplified but functionally the same.