Personally, I’d repot when the first’ set of ‘true’ leaves have developed (the ones that come after the initial seed leaves which appear in the photo). But then I’ve always started mine in slightly larger pots (e.g. 9cm pots) as they grow so fast.
I’m not an expert, though. I was looking for information about growing sunflowers last week and stumbled across r/sunflowers which has 23k members and seems pretty active, so it might be worth searching there too!
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Personally, I’d repot when the first’ set of ‘true’ leaves have developed (the ones that come after the initial seed leaves which appear in the photo). But then I’ve always started mine in slightly larger pots (e.g. 9cm pots) as they grow so fast.
I’m not an expert, though. I was looking for information about growing sunflowers last week and stumbled across r/sunflowers which has 23k members and seems pretty active, so it might be worth searching there too!