Legendary Treasure: Cascade Bust
After fighting the Evilized Greebles, use a Fire Skylander to open the Elemental Gate to the left. Make your way across the moving platforms to reach this.
Seed Packets (1/5)
After battling the Greeble Blunderbuss, take a right at the next fork. Follow the path to reach a secret area where you can ascend some stepping stones to reach these.
Story Scroll: Greeble Lands
Back at the fork, head left and you'll soon reach this block puzzle. Push block A up, right, and up three times to fill a gap. Now push block A right four times. Now you can ascend the ledges and reach the scroll.
Seed Packets (2/5)
After freeing the Gobblepods in the Gobblepod Sanctuary, make a left at the intersection. Bust up the wagons over here and enter the hidden area. Inside, ride the stone on the upper path to reach these.
Seed Packets (3/5)
After exiting Honeybadger Hollow, look down for a ledge you can drop to. Do so to find more of these.
When you reach the next intersection in the Gobblepod Sanctuary, take right to reach a dual Tech/Earth Elemental Gate. Use a Swap Force character with these elements (or two appropriate Skylanders, if you're playing co-op) to open the path. Inside, push the blocks to either side to collect the gears and open the door in this secret area. You'll find this on the other side.
Seed Packets (4/5)
Upon entering Overlook Heights, bear right and follow the ledge as it wraps south to find this.
Seed Packets (5/5)
Proceed through Shadow Spelunk until the path splits. Head left and follow the series of ledges and moving rocks to reach these.