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Novice grower - sunflower seedlings issue

alexemmersonukalexemmersonuk Posts: 171
in The potting shed
Hi all. 
My sunflower seedlings were super happy up to a few days ago. They are on a windowsill indoors at the moment. Now a few leaves are starting to turn yellow. What is this normally a sign of? Also how do I know when they are ready to be potted on? Is there a certain height they need to get to? Or height in relation to pot? Or simply a time frame? Never grown sunflowers before and my little boy is really hoping this works. I am afraid I don't know what exact species they are but I am 99% sure I saw the word dwarf sunflowers on the packet... I wasn't very good at labelling this year ugh!!! Picture below - thanks!
Growing a pink garden, one plant at a time....
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  • alexemmersonukalexemmersonuk Posts: 171

    Growing a pink garden, one plant at a time....
  • FairygirlFairygirl Posts: 53,924
    edited April 2022
    They need potted on when they're outgrowing the pot they're in - ie when the roots are showing at the bottom. That's the sign for any seedlings and small plants.
    If they're getting too much sun, move them away to a cooler sill, or use some shading. A sunny windowsill can be far too much for young plants. 

    Photo's showing now - yes, those are needing moved into bigger pots, and that will give them more nutrition to carry on until they can be planted outside  :)
    It's normal for old leaves to die back, so it's not a major problem. They look fine apart from that   :)
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • alexemmersonukalexemmersonuk Posts: 171

    Growing a pink garden, one plant at a time....
  • alexemmersonukalexemmersonuk Posts: 171
    @Fairygirl
    thank you so much for that, I hadn't thought of checking the roots!!!! I'll check now. 
    Growing a pink garden, one plant at a time....
  • FairygirlFairygirl Posts: 53,924
    They're good and healthy looking   :)
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • alexemmersonukalexemmersonuk Posts: 171
    @Fairygirl
    I feel extremely silly now. I'll go and sort it!
    Growing a pink garden, one plant at a time....
  • FairygirlFairygirl Posts: 53,924
    Not at all - we've all been there at some point  :)
    Just wait until you put pots on a border with the intention of planting them, and they take root through the bottom 'cos you don't quite get round to it. Not that I ever do that of course....  ;)

    They'll be fine. They're quite forgiving, and they'll enjoy their new food and a bit of extra room  :)

    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • Rob LockwoodRob Lockwood Posts: 363
    Made me chuckle this @alexemmersonuk !  As Fairygirl says, we've all been there :)  They look in good nick to me so put them into bigger pots (not too much bigger) and then keep an eye on the bottom of the pot to see when thy're ready for their next upgrade.  Slugs love them so I keep them in little pots until they can fight the nasties off themselves (obvs, that's no help, but when they look like big strong plants, they're ready!).  Great plants, easy to grow and your little boy will love them (and so will the bees, squirrels and birds!)
  • alexemmersonukalexemmersonuk Posts: 171
    They have been repotted now. They look pretty happy, thanks all! 
    Growing a pink garden, one plant at a time....
  • alexemmersonukalexemmersonuk Posts: 171
    @Songbird-1
    I didn't realise they needed support. I have never done support for plants, is it just a matter of getting a stick and tieing to it? I don't know what I am doing :/ 
    Growing a pink garden, one plant at a time....
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