i have been sprouting all kind of seeds for eating.and now i have after a month a litltle box 30\20 with 15 centimetre depth /in it i have around 25 sprouted sunflowers at the height of around 30 cm.since winter is on its way out i thought maybe i can soon transplant them individually into big containers.are they sensitive to transfer? i know their are plants that at a special size dont like to be relocated.