Leaf tips are turning brown

green king · 09-04-2009, 12:08 AM

Hi guys. I've noticed that no matter what I do my leaves get brown tips once they reach a certain size. It doesn't affect the new growth but all new leaves seem to end up with bad tips when they grow big enough. The brown tips develop into brown edges with margins that curl more & more inwards. I had thought it was a magnesium deficiency since I heard that curled leaf margins were a sympom of this and the older leaves did have yellowing between the veins. I started to add Epsom salts over the last week and the yellowing of the leaves seems to have cleared up a bit but the brown tips continue to come. They curl up as well. The 3 smain symptoms are: brown tips, tips curl upwards followed by the margins rolling inward & it does NOT affect new growth, only occasionally. I am not sure what is causing this and have already exhausted a few possibilities.

Hydro Growers:
1. Are you growing from seed or clones? Seed
2. How old are your plants? 1 month
3. How tall are your plants? 2 inches
4. What type of hydro system are you using? Hand-watering daily in Coco Coir
5. What brand/type of nutrients are you using? Coco Canna A + B
6. What is the Ph of your nutrient solution? 6
7. What is the PPM/EC of your tap water? I use Volvic
8. What is the PPM/EC of your nutrient solution?
9. What is the temperature of your nutrient solution?
10. Does your PPM/EC show a rise or fall when you do your daily PPM check?
11. Does your pH show a rise or fall when you do your daily check?
12. Do you foliar feed or spray your plants with anything?
13. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights") 250 watt CFL
14. How close are your lights to the plants? 3 inches
15. What size is your grow space in square feet? 3 foot by 3 foot & 10 foot high
16. What is the temperature and humidity in your grow space? 80F, with a RH of 55%
17. Have you noticed any insect activity in your grow space? A few so I spray my leaves with plant invigorator occasionally
18. How much experience do you have growing? Under a year

green king · 09-04-2009, 12:14 AM

Here are my pics

stoney-trees · 09-04-2009, 12:28 AM

Pics are kind of blurry for me. I dont think you should need to water it everyday.

If its been in that pot a month its most likely rootbound.

I dont know if the paleness is from overwatering or lack of nutrients? Hard to tell for me.

What strength according to your nutrients are you using? And are you letting it dry out?

green king · 09-04-2009, 08:36 AM

Quote:

Originally Posted by stoney-trees

Pics are kind of blurry for me. I dont think you should need to water it everyday.

If its been in that pot a month its most likely rootbound.

I dont know if the paleness is from overwatering or lack of nutrients? Hard to tell for me.

What strength according to your nutrients are you using? And are you letting it dry out?

I water everyday cos its in coco coir and even when I watered every other day the tips still went brown. I have just upped the nute dosage to 2m of Canna A & 2ml of Canna B per litre which is half strength according to the instructions. I don't think it is root bound yet but I will transplant it soon. I will try to get some better pics up

stoney-trees · 09-04-2009, 07:26 PM

A month in a pot the size of your hands...They should be root bound. Not saying thats your problem, but they look held back from that small pot.

Nelson Mutz · 09-04-2009, 07:52 PM

Don't hold it back, green king ... get that into a bigger pot so it can spread out her [hopefully] wings and fly !! I also think increasing the nute feeding is a good idea. My

Nelson

**EMj** · 09-05-2009, 12:24 PM

I have never used canna ab but those look overfed to me. I always had to water every day with coco as well

green king · 09-05-2009, 10:04 PM

Quote:

Originally Posted by EMj

I have never used canna ab but those look overfed to me. I always had to water every day with coco as well

So one of you say overfed whilst the other says underfed. I got my ppm meter today so I can test what the ec of the runoff is. What ec would you recommend I feed them since the ec I have been feeding at recently is 1.9. Is this particularly strong?

Also do you think that the brown tips are related to lack of CO2 since my closet is high but very narrow? The door is generally open though so I would have thought it wouldn't be this. I am starting to wonder whether it is bad genetics from Seedsman White Widow so am thinking of germinating my Dutch Passion White Widow

CRAZYTRAIN · 09-05-2009, 10:39 PM

In my garden my peak feedings in flower are in the 1.9 range on plants that are 3 feet tall and 3 feet wide...I've never grown hydro from seed, but my cuttings start out at .5 EC when I see roots and then .8 when I start veg, and then about 1.1 to 1.4 (strain dependant) when I put them into flower. By this time they are at least a month old and 1 foot tall bushes with 8 or 10 branches.
Tripps says that he NEVER goes over 1.3 EC at the peak of flowering.

1.9 is crazystrong for a plant that size. I'm no cocco expert or grower so I could be wrong, but my humble opinion is that you should flush it for a day or two with only ph'd water, and then start giving it nutes again at about .8 EC - 1.2 EC.... Check with Matt Dredds and see what strength he feeds his 1 month old seedlings, he's a strong feeder.

Your closet is not your problem.. that little plant won't take up that much c02.

green king · 09-06-2009, 10:47 AM

Quote:

Originally Posted by CRAZYTRAIN

In my garden my peak feedings in flower are in the 1.9 range on plants that are 3 feet tall and 3 feet wide...I've never grown hydro from seed, but my cuttings start out at .5 EC when I see roots and then .8 when I start veg, and then about 1.1 to 1.4 (strain dependant) when I put them into flower. By this time they are at least a month old and 1 foot tall bushes with 8 or 10 branches.
Tripps says that he NEVER goes over 1.3 EC at the peak of flowering.

1.9 is crazystrong for a plant that size. I'm no cocco expert or grower so I could be wrong, but my humble opinion is that you should flush it for a day or two with only ph'd water, and then start giving it nutes again at about .8 EC - 1.2 EC.... Check with Matt Dredds and see what strength he feeds his 1 month old seedlings, he's a strong feeder.

Your closet is not your problem.. that little plant won't take up that much c02.

Well my plant has recently been put into a bigger pot so it has had only 1 feeding at 1.9. I think the ec is so high because I put lots of Epsom Salts in the mixture but I had been using 1/4 strength nutes. I have flushed and will start feeding with 0.8 ec

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