I'm skipping one step by not transplanting them from the seed tray as seedling into solo cups but directly in the 10cm containers (I guess those are the same as your 4inch containers) once they are ca 20cm (7inch) large. I bought special seed trays for this with extra deep cells I filled for 2/3 with lighly fertilized potting soil and the top 1/3 with a seeding medium. This works like a charm. Very good root development, better than in the solo cups.
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