Plant Growth spell clarification

Given you can hold concentration in the middle of combat, often even after being struck, I don’t think the mental focus element is that out there. And there’s people who get serious about meditation who can hold a pose for way longer.

Quote from The_Ace_of_Rogues >>

Given you can hold concentration in the middle of combat, often even after being struck, I don’t think the mental focus element is that out there. And there’s people who get serious about meditation who can hold a pose for way longer.

So are you suggesting someone casting a ritual spell should have to roll for concentration? 

Quote from Ravnodaus >>

Quote from The_Ace_of_Rogues >>

Given you can hold concentration in the middle of combat, often even after being struck, I don’t think the mental focus element is that out there. And there’s people who get serious about meditation who can hold a pose for way longer.

So are you suggesting someone casting a ritual spell should have to roll for concentration? 

 
RAW, anytime you cast a spell for longer than one action it uses your Concentration slot.

Concentration is just poorly named.  They could have called it anything.  The only relevant things are (1) you only have one 'slot' for doing it, and (2) if you take damage, you need to make a check to keep the thing in the slot, (3) if anything ends it, you lose whatever you were using the slot for.

So you can concentrate through a short rest.  You can concentrate while solving a math puzzle or playing chess.  It doesn't interfere at all with your ability to 'concentrate' on something in the natural language sense (like deciphering a code).  Only things which explicitly use your concentration slot are exclusive with each other.

Concentration

Some spells and other effects require Concentration to remain active, as specified in their descriptions. If the effect’s creator loses Concentration, the effect ends. If the effect has a maximum duration, the effect’s description specifies how long the creator can concentrate on it: up to 1 minute, 1 hour, or some other duration. The creator can end Concentration at any time (no action required). The following factors break Concentration.

Another Concentration Effect. You lose Concentration on an effect the moment you start casting a spell that requires Concentration or activate another effect that requires Concentration.

Damage. If you take damage, you must succeed on a Constitution saving throw to maintain Concentration. The DC equals 10 or half the damage taken (round down), whichever number is higher, up to a maximum DC of 30.

Incapacitated or Dead. Your Concentration ends if you have the Incapacitated condition or you die.

Quote from Tarod_ >>

Poorly named or not (IMO, it's ok), I think the rules are clear and all start with that line in green:

Concentration

Some spells and other effects require Concentration to remain active, as specified in their descriptions. If the effect’s creator loses Concentration, the effect ends. If the effect has a maximum duration, the effect’s description specifies how long the creator can concentrate on it: up to 1 minute, 1 hour, or some other duration. The creator can end Concentration at any time (no action required). The following factors break Concentration.

Another Concentration Effect. You lose Concentration on an effect the moment you start casting a spell that requires Concentration or activate another effect that requires Concentration.

Damage. If you take damage, you must succeed on a Constitution saving throw to maintain Concentration. The DC equals 10 or half the damage taken (round down), whichever number is higher, up to a maximum DC of 30.

Incapacitated or Dead. Your Concentration ends if you have the Incapacitated condition or you die.

 Yes, and it also gives all the things which end concentration.  Anything not listed does not end concentration.