Does the packet say what variety they are and how tall they grow? When I grew them in pots they kept blowing over on windy days, so I would suggest you weight the pots. If they are tall ones I would want the pot to be at least 50cm wide.
This year I have sown Dwarf sunflowers as I want to put them into pots. These don't grow very tall so I hoping they will be ok in pots. I got the seeds from Lidls and they are growing on very well. I usually pot mine into the next size container when they are still seedlings then when they are big enough I put them into their final pots. Good luck.
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Does the packet say what variety they are and how tall they grow? When I grew them in pots they kept blowing over on windy days, so I would suggest you weight the pots. If they are tall ones I would want the pot to be at least 50cm wide.
I would plant them up now.
This year I have sown Dwarf sunflowers as I want to put them into pots. These don't grow very tall so I hoping they will be ok in pots. I got the seeds from Lidls and they are growing on very well. I usually pot mine into the next size container when they are still seedlings then when they are big enough I put them into their final pots. Good luck.