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Chilli plants - leaf curl / curling upside down?

Noticed this evening a number of the chilli plants were exhibiting leaf curl / leafs curling upside down, mostly new growth / growing tips. 

I think they are getting enough water as there is no leaf droop lower down the plant and there is a little run off from each bag at the end of each day (the solar auto drip watering system waters them every 3hrs in daylight).

They are in a greenhouse, I've added shade cloth (50%) to two sides that get the most direct sunlight during the hottest part of the day and have been opening the doors a bit each morning. 

Theres no discolouration or singing to the leaves. They have had a week of weak strength vegetative growth feed and are on plain water this week with a view to move to flowering feed / tomatorite when the rest have set their first fruits. 

There are no obvious pests. 

Thoughts? 

Photos below:

Posts

  • johnbaronjohnbaron Posts: 75
    A bit of further reasearch online suggests that this may be a calcium deficiency as coca coir has an effect if locking up calcium (I'm growing in 25-33% coco coir). 
  • Pete.8Pete.8 Posts: 11,340
    There are plenty of products that contain Mg and Ca
    Usually called cal-mag, or mag-cal, thy're in a form easily taken-up by your plants.
    That said, I've had a similar problem over the weekend.
    Mine are in the g/h - doors/windows all open and blinds down. I've found the top 1" of 6 of my 8 plants shriveled and dead, the lower leaves and stems all fine, so they'll take over, but the tops have had it. They're in 10L pots that have not dried out, I'm blaming the weather

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • johnbaronjohnbaron Posts: 75
    They seem to have recovered a bit overnight - leaves are the correct way up but still a little crinkled so I'm wondering if its temp related as well. 

    Probably going to give them a bit of calcium for good measure

  • Pete.8Pete.8 Posts: 11,340
    If you do give them calcium I think you need to give Magnesium too. I can't really remember, but I think one can lock out the other. I think that coir has a lot of potassium which can have the effect of locking up the Ca. Using Ca may cause a further imbalance which causes more problems.
    I think if it were me, I'd stick to tomorite. If you only have 25-30% coir I doubt it's having much effect. I use seaweed extract on just about all my veg/salad stuff, it does work wonders and contains all the micro-nutrients that plants need. It should be used in addition to your fertilizer as it is not a fertilizer in itself, but not at them same time you give tomorite or whatever..
    I believe that chili/peppers are slightly different when it comes to fertilizing. AFAIK start using tomorite when the first flowers appear, rather than waiting for the first fruits to appear as you would with toms. 

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • ItalophileItalophile Posts: 1,731
    edited July 2018
    Was it particularly warm the day they wilted? That they recovered overnight suggests to me it could just have been heat stress, particularly if the door was closed during the day. They look incredibly healthy to me, I wouldn't be dosing them with anything. 

    I also wouldn't overfertilise them. They're like tomatoes, less is better.
  • johnbaronjohnbaron Posts: 75
    I've been opening the door each morning. They seem to turn there leaves over by the end of the day and then recover over night. However I have noted that some of the flower buds seem to have yellowed and died off before they have properly formed. 



  • ItalophileItalophile Posts: 1,731
    I think they’re overheating during the day which would also stress the flowers. It can get very hot inside an enclosed greenhouse. Can you leave the door open during the day? Or provide some form of ventilation?
  • johnbaronjohnbaron Posts: 75
    I've been opening one of the doors a bit but I think I'm going to fully open both siding doors over the next few days and see if it helps. There is also a side window which has an auto opener on it. 

    Might have to invest in a thermometer and check max temps. 
  • ItalophileItalophile Posts: 1,731
    Good idea. You might get a fright when you see how hot a greenhouse can get on a hot day, even with some ventilation. Mid-20s C is about the maximum you'd want on a consistent basis in the closed environment.

    I also just noticed in your OP that they're being automatically watered every three hours. If that means the mix is pretty much permanently wet, it's not helping the plant.  The roots can become waterlogged and the plants bloated with moisture. That, along with the heat, may be contributing to the flower issue. Chillies are like toms, they respond better to "tough love" than pampering. In pots, ideally, the mix should be allowed to dry out between watering. 
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