If I change a block’s beds, does it change my past seasons?

No, so your farm can grow without rewriting its history: a change applies to the season you are viewing and the ones after it, never to earlier ones. Lengthen your beds in 2027 and your 2026 season keeps its beds, its plantings and its figures.

To change a block from a given year, pick that season at the top of the page first, then Edit the block. Its History tab lists each change, season by season, with the value before and after. Removing beds takes the plantings that were on them off their beds: place them again on the Crop Map.

See Edit, move or remove a location.