I've grown some annuals (e.g. sunflower and cosmos) and pricked out the seedlings into small pots (one per seedling). Once the roots started to show at the bottom, I potted them on to 3 plants per 9-inch diameter pot - as per photo - which are now in my conservatory.
Is this alright or could it cause any issues? The reason I've done it like this is because I don't have space inside for each plant to have its own pot. Once the nights have got a bit warmer I plan to then pot them on into individual larger pots outside and plant some in the ground.
Thanks!