When to pot on thunbergia alata/black-eyed susan?

Hi everyone, I've been growing plants from seeds for the first time - thunbergia alata. I sowed them in November/December, 3 seeds to a plug, and some of them seem to be doing ok I think (I hope, anyway!). I was wondering whether I need to separate the taller seedlings into their own plugs, or whether they're ok to share a plug until they're planted outside around May? Does anyone have either general advice or advice for thunbergias specifically?
ps excuse the mini obelisks - I watched a video that said they needed them, spent like an hour making them for my first batch, and then 2 weeks later learnt that they were (with hindsight, obviously) useless for seedlings haha. Oops. Live and learn.

ps excuse the mini obelisks - I watched a video that said they needed them, spent like an hour making them for my first batch, and then 2 weeks later learnt that they were (with hindsight, obviously) useless for seedlings haha. Oops. Live and learn.

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