I use a small notebook, lined 8x11
I record for the year over several pages but separated by activity.
The planting one includes columns for
Date, plant /seed name, germination or transplant date
Quantity, row location, harvest date, and comments
Another page is for weather including temps and precipitation.
One page for seed ordering
Another for watering log
A garden map for crop rotation purposes
Makes it easy to flip back a few pages to the previous year/years