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From what I've learned when you used verb + たら, you are saying an if condition. While reading I came across:
起きたら生えてたの which I interpretate as "When I woke up, (they) had (already) grew."
Is this correct? sometimes たら or others conditionals works as "when"?
Whether to translate it as “when” or “if” is due to a distinction English makes and has little to do with Japanese.
たら focuses on a state where some event has just completed. If that event is hypothetical, “if” would be more appropriate. In your case, the main clause talks about something the speaker actually found out at some point in the past. Then the completed event of her waking up cannot be hypothetical.
I think the term “conditional” is misleading.
The ～たら ending does indeed also serve as "when", not just "if". One of my Japanese teachers years ago explained this as a contraction from ～てから. While that fits for the meaning, my research over the years into Japanese etymologies suggests that this isn't the derivation.
The ～と conditional could sometimes also be translated as "when".
The ～えば conditional does not have any such "when" connotations.
