my sunflower and sweet corn have reached 10 cm height.they are growing in a very narrow planter(specially for seeds)its 5cm\5cm and 20 cm deep .it is like an upside down piramid.very narrow.i tried to transplant a sunflower seedling but it fell appart.the soil came away.whats the best way to transplant?is it right to let it grow many roots and then to stop watering it so it is easy to pull out?is that not too stressfull for the plant?
