Hey guys and gals,
My plant is about a month into flowering and some of the leaves are showing unusual coloring. Certain parts are yellowing and drying, while others seem to be spotted with dark green. I have a few pictures that should represent the problems I'm having. I'm wondering if it is nutrient imbalances/burns. This is my first plant and I'm just going by sight on whether or not I am doing a good job. As a whole, the plant is looking healthy. Maybe 10% of the leaves are the yellow colored or have the spots. Another thing is that the grow space is on the hotter side, so I suppose it could also be heat that might be causing some of the drying out. Let me know what you think, any input would be great.

-King of Potopia

PS - The flowers are all looking good, and the white hairs have just started to change orange. It is just some of the leaves, mostly the sun leaves, that are looking unusual. I'm not too concerned at this point because everything else is looking good. I'm just trying to understand what is happening so I may be able to avoid this happening in my future grows.

Here are a couple more photos, since I don't know how to add them into my actual post yet.

Looks like an environmental issue rather than a nutrient issue but it would be better to see a picture of the whole plant if you can. Maybe over watered?

In the 1st & 4th pic there's some curling-down of the leaf margins.

When my plants get to the stage you're at, this generally happens as a result of slight overfeeding... although they don't recover so it could be from some time ago?

Some stats might help...

· What EC are you feeding them at, and have there been any patterns to changes in the EC recently (eg repeatedly rising/falling)?

· What pH is the nutrient solution that you're using?

· What are your ambient air temps. & humidity like?

· How far away is your light from the top of the plants?

Any judgement without these figures is going to involve potentially misleading guesswork...

Hopefully someone will be along soon...

Cheers

Stan

...forgot to add - a pic of the whole plant (ie the position of the affected leaves and the condition of the others) would also help...

hey there potopia, if you a month into flower and from your pics it looks like theyve developed bluey/purple hues,(im guessing its the older fan leaves on the bottom half of the plant)
IMHO this would suggest a phosphorous(p) def. (P) is very important during flowering stages and influences the vigor of the plant
(P) is mobile and moves to new growing areas(buds) -y the def. shows in older growth.
as for the yellowing leaves an spots could be a couple things, just monitor it
-again more info on nutes and ph would be helpful for more accurate diagnosis.
hope this helps, any one else confirm?
BuddyP

looks very much like phosphorus deficiency mate.

Potopia - if you agree that there's a deficiency, then I'd caution against adding additives to try to rectify the problem.

According to your profile you're growing in hydro - the nutes should contain all the elements a plant needs. So, if it is a deficiency then it suggests that, for some reason, your plant is failing to absorbe the element in question.

Factors such as res. temperature, res pH, and overfeeding/underfeeding can result in a plant struggling to absorbe certain elements.

This is why I think that you need to give more info. for us to be able to help you. From the look of your profile I reckon it would be worth finding-out a little more of how your system works - perhaps ask the person that you inherited it from.

ATB

Stan

Thanks for all the advice and feedback. I don't really have any details about my growing environment, and I haven't been able to take good pictures because my HPS light creates huge contrasts that make it impossible to see any detail. I just have this plant in my closet and the light is about a foot away on the side. I've tied the plant down away from it to keep the leaves from burning. The funny thing is that the leaves that are curling and drying up are on the side farthest from the light, and the ones near the light seem to be doing fine. I've messed up so many times feeding my plant that I'm pretty sure it is a nutrient deficiency. I ran out last week and just bought some more, so hopefully the new ones will help. Also, I have no idea how old the nutrients were I was originally using; but they were probably at least a year old or so. How long does it take for nutes to go bad, if they even do? I have so many freggin questions about this whole process, but I am going to be patient and just read a lot. My next plant will be done in a different hydro system, because the one I'm using just isn't that great and now that I know the general idea I can make a better one. Thanks again for the advice, I will try and figure out more of the details you've asked me for.

What is EC?

Also I have been rotating my plant 180* once a week because my light is along the side of the plant. Is this a good idea to ensure all areas get good light? Or should I be doing it more/less frequently? I have to do it because the plant reaches the top of my grow space

¿You're growing hydro, but you haven't found out what EC is yet?

EC is a measure of how strong the hydro nutrient solution is - this, along with it's pH are *essential* pieces of information to have any hope at all of an even slightly successful hydro grow.

HID lighting does indeed cause interference with digital cameras - just take the pictures under normal (sun or incandescent lighting).

Temps & humidity are also useful to measure - you can pick-up a Thermo Hygrometer for about a tenner - it does both.

ATB

Stan

I found this post to be useful: http://www.uk420.com/boards/index.php?s=&a...st&p=952011


I also find this to be useful: http://www.uk420.com/boards/index.php?show...p;hl=genefinder

ATB

Stan