I observed this pattern of growth for A. halleri in contaminated soil with some amendments. Usually rosettes are on the surface, what can be the reason of for this pattern of growth? Can it be fixed?
I usually see this elongated pattern on plants that do not get enough light. It happened to me with lettuce that were growing in a shady shelf. I hope it helps.
Gerardo Hernandez thank you for the answer. It seems the same because seedling in darkness (in first few days) have this pattern and the rest are fine. Thanks again.
and did you try something during the experiment to resolve the problem?
I agree with Gerardo, the seedlings are very elongated, likely due to low light. This etiolated phenotype cannot be reversed for existing seedlings, but can be prevented for any new plantings by having increased light intensity. The hypocotyls ("seedling stem") are what you are seeing on the surface, the roots are still under the soil. You could dig up a few seedlings to check on the roots (this approach may kill the seedlings so if you need them alive then skip this step!)
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