After completing the Dancing Dragon Dungeon, the Maku Tree says that he had a vision of a lake shaped like eyeglasses. This lake can be found east of Impa's house.

Optional: Continue the Trading Sequence

If you got the Goron Vase from Biggoron, use a Gale Seed to go to the tree in Sunken City. Go to the northwest house and talk to Ingo. When you give the Vase to Ingo, he gives you Fish. You can use a Gale Seed to go to Horon Village, then go north from Horon Village and give the Fish to the guy east of Impa's house in exchange for the Megaphone.

Back to Subrosia

If you aren't already east of Impa's house, use a Gale Seed to go to Horon Village, then go north from Horon Village, then go east from Impa's house.

Go north, then east. You should be in the screen where you danced with Din at the beginning of the game.

Go south and use the Roc's Feather to jump over the holes. Swim to the southeast corner of the area. There is a portal to Subrosia there. A sign says that you can only pick the petrified mushrooms in fall. Go into the Subrosian portal.

Get the Bomb Flower

Go south from the portal that you arrived from. You will eventually reach an area with a volcano. Jump over the holes and continue south. After you cross the bridge, go west. Use the Roc's feather to jump onto the narrow strips of land. Go west. This area has a Fire Pokey. If you get too close, it shoots fireballs. You can kill it with your sword. Go north, and there are two Fire Pokeys in this screen. Jump onto the southeastern platform, then go east. Keep going east along the southern platforms, then jump north. There is something buried in the ground. Use the Power Bracelet to lift it. It's a Bomb Flower. It doesn't go into your inventory. It's shown on the screen with the rings and gasha seeds and trade sequence items that you have collected.

Get the Power of Autumn

Go back the way you came, crossing the bridge and jumping over the holes. You will see a house. You can optionally go in to find a a Subrosian who tells you how many signs you have broken. This Subrosian will give you a ring if you break 100 signs. You can break them by hitting them with Ember Seeds, or using bombs on them.

Otherwise, go west from the house. Jump over the lava, then go west and north. Lift the rock, then use a Pegasus Seed and the Roc's Feather to jump over the gap of two holes.

Go north from the Subrosian who is carrying buckets, then jump over the lava and go east to enter the Temple of Seasons. Go to the northeast and jump over the lava. Talk to the Subrosian with the headband. He will use the Bomb Flower to open the path to the northeast tower.

Go inside and jump north to the stairs. Go up and continue on to the altar. The Spirit of Autumn will add the Power of Autumn to the Rod of Seasons. The Spirit mentions that in Autumn, pits are filled with fallen leaves, and mushrooms can be picked.

Go to the Next Dungeon

Exit the Temple of Seasons and go west to where you can jump over the lava and go down the stairs to the south. Go east and use a Pegasus Seed to jump over the holes. Go south, then east, and jump over the lava. Go east until you can go north, and keep going north to find the portal that you used to get here. Step on it to go back to Eyeglass Lake. Go west, then north from the screen with the treasure chest surrounded by holes. Go north to the tree stump. Use the Rod of Seasons to turn it to Autumn. Go south, jump over the holes, and swim east. Get on dry land and go north twice, then east. Pick up the mushrooms with the Power Bracelet (if it isn't Autumn, go to a tree stump and turn it to Autumn and come back here) and go into Unicorn's Cave.