Soil too hot? Burning plant?

roamingrichy · May 29, 2015

Hi all,

Feel like crap coming here asking for advice (again), but getting worried about my Blue Thai strain this year. They're outdoor only, potted in approx. 60% soil/40% coco coir.
Feed them very little once a week (Bcuzz A/B from Atami).
I have 2 theories - 1) the soil might be getting too hot. It's approx. 30º Centigrade now in the sun here in Spain or 2) the feeding is destroying the plants. Last year I was using only coco and the plants were magnificent, might have to swtich to coco to be honest.
Anyway, any thoughts would be greatly appreciated.
Thanks

polishpollack · May 29, 2015

Usually when the lower leaves start to yellow, they do so because of low nutrients, usually nitrogen. Are you following the feeding schedule?
you have another problem which could be heat related. 30C is pretty warm. container plants need more water than usually, especially when it's hot outside. you might consider transplanting as that plant is starting to outgrow the pot. find a way to keep it cooler if you can.

roamingrichy · May 29, 2015

Thank you Polish - appreciate the reply. Will look into the feeding schedule more carefully and think about planting to larger pot.
Do you think it would be too late now to move it entirely into coco?

polishpollack · May 29, 2015

I've never used coco. any reason why you would? how about you just stick with potting soil. or mix soil with coco or perlite. I don't understand people's fascination with coco. there no nutrients to it. maybe it retains water better which is what you'll need in a warm climate. after transplanting, if you could cover the pot with insulation, like old newspapers or straw, that would be good, to keep the heat off of it if the plant must be outside. you'll probably have to water every day, maybe twice a day. container growing in a warm climate is tough.

roamingrichy · May 29, 2015

OK thanks, the only reason I mention coco is because I've had such crackin results in the last couple of years with it. First time in 3 years I'm back to soil and I'm getting issues, just annoying.
Such fiddly little plants!! Not like a tomato, pepper or cucumber -. those babies won't stop growing.

polishpollack · May 29, 2015

This kind of plant can grow to 20 feet or about 6-7 meters outdoors. If you had success with coco, maybe you should go back to it. here's some stuff I found on coco, if you didn't know this already.
http://forum.grasscity.com/coco-coir/620656-askeds-coco-guide.html

roamingrichy · May 29, 2015

Thanks for that, it's a great post actually.

roamingrichy · May 31, 2015

So I transplanted to a larger pot, an 80l grow bag, topped with hay. Hopefully this does the trick.
I do have a question, if the problem persists, will this ultimately ruin the plant?

polishpollack · May 31, 2015

I really need more info. Write everything you can about your grow. day temp, night temp, humidity, ferts and how often, what do the ferts contain? what fert is in the soil? everything.

roamingrichy · May 31, 2015

OK,
So day temp is currently 22-32 centigrade, night temp 14-19. Humidity currently 30-40%.
Soil is top range already mixed, see pic attached and I'm feeding her 5ml/10l once every 2 weeks. Comp of nutes in pic attached.

roamingrichy · May 31, 2015

And water them a little each day, water is tap ph 7-8.5. Same water I use each year.

polishpollack · May 31, 2015

could use close up pics of the leaves, especially those that look damaged. clear pics in white light would be nice.
Right now I'm saying heat stress. 32C is about 95F, which we use in the states and that is way too warm for an indoor grow. it would be smart to put an oscillating fan on the plant, to bump it around some and cool it down. close pics please. also covering the entire pot with hay might be better. growing the plant in a cooler environment better still.

polishpollack · May 31, 2015

after reviewing this thread I see this is more of an outdoor grow. all the same, your temps are very warm for a plant growing in a container. watering every day may be necessary.

roamingrichy · May 31, 2015

Photos coming up....

roamingrichy · May 31, 2015

Yes, this is an outdoor grow only so option of fan is nigh on imossible

polishpollack · May 31, 2015

when you water it should be all the way through so water runs out of the pot bottom. is the coco drying every day such that the pot becomes easy to lift? if so, you probably have to water more. if not, then don't. it looks like the plant is pulling nitrogen out of lower leaves and using it from growth at the top. plants can do this with nitrogen because it is a mobile element. I don't know if giving fert every two weeks is enough. I'd give fert once a week, maybe give a dose now, and see what happens in a couple of days. interesting that you're using soil and appearing to have nute problems. with heat like it is, I'm not sure which is worse here, nutes or heat. maybe it's both.

race · May 31, 2015

U have calcium and magnesium lockout probably coz of low ph of the coco(imo u aded way too much coco). did u add dolomite lime when mixing?

roamingrichy · May 31, 2015

Thanks guys, I've given them more nutes and watered them well, lets see how they do in the next few days.
I didnt add any lime to the mix and perhaps I was over zealous with the coco I love so much.
Will keep you posted if thats ok.

roamingrichy · Jun 12, 2015

Not sure if covering with hay has helped. Since putting it on my plants have become infested with tiny black bugs and now with small green worms.
Is it possible the hay was harbouring bugs? I know it often happens with pets such as rabbits and hamsters.
Think I'm going to remove the hay...

Soil too hot? Burning plant?

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