Why my sunflower plant's leafs are turning yellow? How much temperature they need?

Question

@SvelteKingfern · Answer

The leaves are yellow. It looks like too much or not enough light, or too much or not enough water, or too much fertilizer.

@Ada3 · Answer

Is it springtime yet? The best temperature for growing Sunflower 🌻 is between 21-26 degrees Celsius; ( or 70-78F).  The lowest temperature they can tolerate is 6.6 C. 
I’m sorry your Sunflower leaves are turning yellow. I hope your plant will make a speedy recovery.  I hope this website will help: https://plantophiles.com/plant-diseases/sunflower-leaves-turning-yellow/

@Vinxy2 · Answer

Oh it’s so tiny. 
I’d be careful with watering- that’s usually the reason for yellowing leaves

Why my sunflower plant's leafs are turning yellow? How mu...

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