Normally when I harden my plants I do so on consecutive days. This year that was difficult as the sixty and seventy degree days was interspersed with snow. The forecast is looking better next week so I hope to get the plants outside and planted. Even with topping, they are outgrowing my growing chamber.
The question was asked about topping seedlings. I have never done so but I am being forced to this year. After no germination last year, I planted my seeds earlier than normal and they have grown like weeds, to the point they are toppling over.