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These sunflowers are on my window ledge getting ca 8h of sunlight per day. When they lack water the leaves start hanging dramatically. 30 minutes after watering they correct themselves. Plants look pretty healthy all around to me except for the yellow leaves. I get these on EVERY sunflower I have.

I water them thoroughly as soon as the top 3cm dried up which is around once every 4-5 days. Pots are properly drained.

enter image description here

Earth specs:

  • Ph 7.2
  • 200mg/l Nitrogen
  • 170mg/l Phosphate
  • 950mg/l Potassium
  • In none of the pictures is what you're growing them in fully visible - possibly the containers are too shallow? – Bamboo May 16 '18 at 16:57
  • Containers are same as here, ca 4.5l: gardening.stackexchange.com/questions/38673/… – AzulShiva May 17 '18 at 12:08
  • They look like shallow troughs - in which case, your sunflowers need deeper pots. – Bamboo May 17 '18 at 18:32
  • Are you sure? They are dwarf sunflowers, only get 50cm tall – AzulShiva May 18 '18 at 8:31
  • Not 100% no because I don't know how many plants you have per trough, nor exactly how deep the troughs are, but I'm assuming more than one plant per trough and an average depth of 3 or 4 inches – Bamboo May 18 '18 at 9:12
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Probably the cause is lack of root room, since you're growing them in fairly shallow containers. Pot them up in good sized pots to allow space for good root development.

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