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purpling in under side of leaves of very young San Marzano tomato seedling

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  • FairygirlFairygirl Posts: 55,117
    I wouldn't be worried. As @Pete.8 says, it's the difference in temps that can cause the problem more than anything, and especially if small plants are trapped between curtains/blinds and the glass.
    Windowsills are great to start off all sorts of seeds, but even a small amount of sun at this time of year can send temps soaring, and then they drop markedly overnight. 
    My kitchen is south ish facing. In the recent sun, it can easily reach 35, and I pull the blinds down. It's never that temp in winter when I have the heating on - it's about 20, unless the oven's on. 
    I've not had the heating on at night for two weeks, because it isn't needed, but the temps on the windowsills are less than half that overnight. The heating is only on for a short while in the morning, which is enough to warm things up to my liking. 
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • REMF33REMF33 Posts: 731
    I have moved most to the sitting room or under the grow lights upstairs. re the former... and thus the spring sitting room jungle begins!
  • DovefromaboveDovefromabove Posts: 88,147
    edited March 2022
    Pete.8 said:
    If your pants are on a windowsill they will get quite a chill at night and that is the most likely reason for the purpling.
    😱😳… well @Pete.8 … that is one possible explanation …..!!!!!!!!!!!! 😉 

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.





  • Pete.8 said:
    If your pants are on a windowsill they will get quite a chill at night and that is the most likely reason for the purpling.
    😱😳… well @Pete.8 … that is one possible explanation …..!!!!!!!!!!!! 😉 
    Perhaps they are a little elastic
    Beautiful North Wales - hiraeth
  • Pete.8Pete.8 Posts: 11,340
    Pete.8 said:
    If your pants are on a windowsill they will get quite a chill at night and that is the most likely reason for the purpling.
    😱😳… well @Pete.8 … that is one possible explanation …..!!!!!!!!!!!! 😉 
    🤣🤣 I still didn't see it at first :smile:
    I never wear them anyway 😁


    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • REMF33REMF33 Posts: 731
    I didn't like to say anything... :D
  • DovefromaboveDovefromabove Posts: 88,147
    But you know me @REMF33 ... Ive never been known for my reticence 🙄🤣😇

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.





  • REMF33REMF33 Posts: 731
    Ha :D
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