Fri 22 Jul 2022, 20:30
I assume they accomplish it, by mysterious rituals only elder elves know about, maybe they can impose their collective will to force nature to enter in a faster grow rate from time to time. perhaps when the elven seasonal festivals take place, they are in fact, offering "mana" to the elder elves from Stillmist, so they can gather enough power to influence the vastness of forbidden lands.
To be fair, this rate may even be indiscernible for short living races, like humans, goblins, and wofkins.
I believe the authors themselves, don't have a clear and definitive answer for this question. So Its up to you to solve this as a GM!