I also asked the question of thinning the seedlings - is it really necessary to plant three and then thin down or is it just a great way to sell seeds? It it was hard to thin out my seedlings after having nurtured them for weeks, starting way back when there was still three feet of snow on the ground.
In a situation like the one above I ripped open the peat container and split it in two and even sometimes three so I could plant all of the seedlings. Perhaps it seems to have worked with lupins because their long tap root grows straight down and does not tangle with the others.
Only time will tell if my strategy has been successful. In the interim, I have planted two more trays of lupins - one seed per cup - that I will continue to transplant around the cottage later this summer.
Wish me luck!
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