I planted a few pumpkin seeds in pots 2 to a pot and left in my greenhouse, after about 4 weeks I had 2 lovely looking plants in one pot each with 3 leaves, at this point I transplanted them each into there own bigger pot. Within about a week one and then the other went really limp, turned light green almost yellow and then died off.
I have been watering and each has been sat in a tray to ensure I don’t over water, any suggestions what I can do differently next time?
I am in the UK and April this year has been unseasonally hot.