EastScape Wikibuilt from the game itself

Sun seeds

Where to find it: The Lantern Mire (Tax Wraith), The Boneyard (Tax Wraith; Sorry Ghoul; Bone Idle; 2 more), The Wilderness (Tax Wraith; Sorry Ghoul), Cloudreach (Sulking Revenant), The Gloam (Bone Idle), The Deep Wild (Grim Lich), The Golden Sands (Bandaged Debtor), Cinderville (Sootwing Harrier), Thornspire Crown (Bough Strangler; The Green Eclipse).

“Plant them on your island. They grow the flower that element's ink is brewed from.”

Dropped by

MonsterLevelHow manyChance a killRoll
The Green Eclipse1226–10AlwaysEvery kill
Sootwing Harrier1051–213%One of the table
Bough Strangler1161–312%One of the table
Grim Lich6612.5%Own roll
Tax Wraith281–20.8%Own roll
Sulking Revenant451–20.8%Own roll
Sorry Ghoul301–20.8%Own roll
Bone Idle161–20.8%Own roll
The Critic421–20.8%Own roll
One-Eyed Usher361–20.8%Own roll
Bandaged Debtor431–20.8%Own roll
Restless Ghost151–20.8%Own roll
Restless Ghost (deeper)351–20.8%Own roll
Night Porter161–20.8%Own roll
The Pit Boss361–20.8%Own roll

Grows

Plant it on your island's plots (Harvesting 15): ready in about 60 minutes, logged in or not.