If you don't spend your seasonal currency then they will exchange automatically the day of season change at the rate of 5 of what you have to 1 of the new currency.
Example: If you have 10 pearls and they exchange you will get 2 candies for fall. Always pay attention to our pictures you will always see that there will be 5 of what the current seasonal currency is to 1 of the next seasonal currency.
At the beginning of the game, there wasn't any exchange at all and it was either use them or lose them. Now we offer 5 to 1 exchange. If you had lots of season value just at the beginning of a season, there would be not enough things at all to spend them on, etc. and every season you would get more and more season value, just overstocking it.
➡ We warn about the exchange rate every time, and that's why it's called season value: because it's valued only during the season. We see no reason to take lots of seasonal currency to the next season because there isn't much at that beginning of a season in the shop to purchase with the currency and we give plenty of quests for buildings that drop the seasonal currency during the season as well as have sales for buildings that also drop seasonal currency.
Option 1 ~ you can spend the seasonal currency on whatever you want all through the season.
Option 2 ~ You can save the seasonal currency until the end of the season and wait and see if we have chests or something else special to spend them on (sometimes we do, sometimes we don't )
Option 3 ~ You save them all season or save what you have left and they exchange automatically the day of season change at the 5 to 1 rate.
Hope this helps you. I have also attached a picture so that you can see the different currencies the game has.
They also have the months on the picture ~Jenn