The 6th level spell Druid Grove (XGE p.154) lets the caster pick various effects for the targeted area. One of the possible effects is
Grasping Undergrowth: You can fill any number of 5-foot squares on the ground that aren't filled with fog with grasping weeds and vines, as if they were affected by an entangle spell.
And the Entangle spell works the following way:
Grasping weeds and vines sprout from the ground in a 20-foot square starting from a point within range. For the duration, these plants turn the ground in the area into difficult terrain.
A creature in the area when you cast the spell must succeed on a Strength saving throw or be restrained by the entangling plants until the spell ends
Since Druid Grove has a casting time of 10 minutes, it seems unlikely that you could successfully cast it during a combat encounter to activate the restraining effect from the Entangle spell (which has a casting time of only one action) and instead only get the difficult terrain. But difficult terrain is also overshadowed by another feature of the Druid Grove, "Solid Fog" that among other effects also causes "every foot of movement through the fog costs 2 extra feet", which overshadows the 1 extra foot caused by regular difficult terrain.
So, why would one choose to use the Grasping Undergrowth effect at all? (apart from the role-playing aspect of being able to use it as seats or a bed)