In Pixelmon, the crafting recipe for the Galarica Cuff (used to evolve to Slowbro) is 8 Galarica Twigs in a circle. Since the Galarica Wreath uses 15 Twigs, I think it would be appropriate to have it crafted by having the Cuff in the center slot of the crafting table, surrounded by 7 additional Twigs.
(Unfortunately, I am unable to provide a picture of my proposed recipe. If someone would be willing to make one to use as a better reference, that would be most appreciated)
That way, the number of Twigs used in crafting the Wreath would be consistent with the amount used in The Crown Tundra, but would still fit into the 9 slots on the vanilla crafting table.