I started a dozen echinacea seeds indoors about 5 weeks ago. 11 seedlings germinated and are now in 3" pots and about 2" tall with 1 prominent true leaf growing and a second just starting. I am still a bit of a novice and didn't know about cold stratification before planting, so the seeds didn't go through that process. While they showed a good pace of growth initially, they've slowed and stayed the same height and had very slow development of a second true leaf in the past 10 days. Wondering if lack-of-stratification is to blame or perhaps something else? They're getting about 16 hours of light a day between grow lights and protected outdoor patio light (it's warmed up enough to have them out).
Any thoughts would be greatly appreciated! Thank you.