Two trays look unmistakably different on sowing day. Several weeks later, after watering and rearranging, the label has faded and the distinction is much less obvious. A small record made at the start prevents a season of guesswork.
Give each batch a short identity
Write the crop, variety and sowing date on a suitable durable label. Add a short batch code if you are comparing seed sources or sowing dates. Keep the full details in a notebook, including the seed packet information you may need later.
Put a label in each independently movable tray or pot group. A single label at the end of a bench stops working as soon as someone changes the layout. Keep labels positioned where they will not be buried or pulled out during routine care.
Test your writing method on a spare label with water and light exposure before trusting it for an important planting. “Permanent” on a pen is not a promise that every plastic surface and outdoor condition will preserve the mark equally well.
Carry the identity through transplanting
Before moving seedlings, prepare the destination labels. Transfer one identified batch at a time, then update a simple bed or container map. If a label is lost, record the uncertainty. Do not confidently assign a variety from a young leaf’s appearance unless you have a sound basis for identification.
At harvest, connect a useful observation to the batch: germination was uneven, transplanting happened later than intended, or one location stayed wetter. Keep observations separate from explanations you have not tested.
This system need not become a complicated database. A label, a date and a notebook reference are enough when they stay connected. The aim is to make next season’s decision from a record rather than from whichever tray you happen to remember best.