The last seasonal foraging bundle you'll have to finish for the Community Center will be this one. Winter Root and Crystal Fruit can be earned as drops in the mines any time of the year. The former can also be found by tilling soil or digging up those Artifact Spots (or Worm Spots) in winter. The same goes for Snow Yam.
You can also find Crystal Fruit and Crocus by foraging around in winter. All four are required to complete the Winter Foraging Bundle which offers Winter Seeds as the gift for finishing it. Even if you don't care about earning these seeds for planting on your farm, you do need to tackle this bundle in order to restore the Community Center with the final goal of having your Greenhouse repaired.