I am just getting started with seedlings also. So I find this very interesting and relevant to my efforts at the moment.
My plan is to plant my seeds (up to five per cup) in plastic cups in the ground and put a vinyl blind label in the cup with an ID on it.
When the plants get large enough then I will remove them from the cups and give each seedling a separate vinyl blind label with it's own ID.
I am thinking due to limited space I will not be able to grow more than 5 seedlings of each cross, and still may not be able to plant all the crosses , just according to how productive my efforts result in being.
I am still playing with the plant list allowing us to enter my seedlings. My system right now for adding an ID to each seedling looks like:
2017F01a,
1. 2017 the year of the cross ( might should have used just the last two digits)
2. Initial of the hybridizer(I have seeds and seedlings crossed by other people)
3. A sequential number for the cross
4. A an alphabetical letter for each seedling
I will have all this info entered into the new Plant List addition Dave just installed for keeping up with seedlings and NOIDs.
This photo was made before I came up with my new numbering system, and before I built my new beds, but it shows the vinyl blind labels I plan on using and the general idea.
Oh forgot to add: .
I limited the number of pollen parents chosen and made a list of the plants pollinated by each. If I did more I added those to the list.
By keeping it limited to only three or four pollen parents it makes keeping up with them much easier,(I did how ever actually stray a bit and a few plants ended up being pollinated by more than one cultivar) so those I will not be able to tell who the pollen parent is. But, it was worth it to me being I needed no clips, ties, etc.
I know there will be a few mistakes along the way and I will have some bee pods throwing things off a bit, but to keep things simple and fun I elected to go this route.