Courgette long stems
I'm new to growing from seed this year, and need some help! I sowed some courgette and basil seed at the end of April, and sunflower and echinops about a week ago. All germinated well. However, my courgette and sunflower seedlings, while growing fairly quickly, seem to have rather long stems which is causing some to flop. What should I do? Is it time to pot into a larger pot and if so, how deep should they be planted?