Crimson Seed Talisman +1 is pretty easy to find in Elden Ring Shadow of the Erdtree. It is in the Southern Shores region where you can find 2 other Talismans as well.
First, you need to visit the Finger Ruins of Rhia. This location is key to obtaining the Crimson Seed Talisman +1. Ensure you have received the Ruins Map, which will guide you to this area.
Once at the Finger Ruins of Rhia, ring the bell located there. After ringing the bell, travel to the Cathedral of Manus Metyr. Here, you will meet Count Ymir.
Speak with Count Ymir at the Cathedral of Manus Metyr. After a brief dialogue, he will reward you with the Crimson Seed Talisman +1.
The Crimson Seed Talisman +1 greatly boosts HP restoration from the Flask of Crimson Tears. This enhancement can be particularly beneficial during challenging battles, allowing you to recover more health with each use of the flask.