The item ID for Ancient Seed in Stardew Valley is:
The above cheat code applies to all platforms including PC/Mac (Steam), XBOX One, PS4 and the Nintendo Switch.
Spawning items in Stardew Valley is not done via commands, but rather through a cheat in which you must set your character's name, or the name of an animal, to the item code of the item you wish to spawn surrounded by [ and ].
To spawn this item using an animal's name, visit Marnie's Ranch, speak to Marnie and purchase an animal (we recommend a chicken as it is cheapest). Name the animal  and press OK. You will then receive the ancient seed item.
You can only set your character's name once, at the start of the game (when you create your world), for this reason we recommend you use the animal name method. If you do wish to use this method, first set your character's name to  when creating your save. Whenever you speak to a villager that says your name in dialogue (for example Gus at the Stardrop Saloon) you will be given the ancient seed item.
If you need more help with spawning ancient seed, we have a detailed guide on our blog - click here to visit that page.
The Ancient Seed item must first be converted into Ancient Seeds before being plantable. Technically, this item is an artifact. It can be found by digging in artifact spots located at Cindersap Forest, the Quarry and the Mountains. Some creautres like Bugs, Cave Flies and Grubs (along with their mutant forms) have a 0.5% drop rate for this item.
It's a dry old seed from some ancient plant. By all appearances it's long since dead...