Yellow Leafs.. Heat Stess?? CFL

[Rusty Trichome]

Not heat stress.

Let the medium dry between waterings. Water slowly till the point of runoff. Don't water again till soil is almost dry. Obviously this is different for each comtainer, each medium and each growroom condition. It's something you'll have to get used to. Once on a feeding schedule, same thing. Water till runoff, let dry-out. If still a few days before next feeding, add some fresh, properly ph'd water. If having problems with medium staying too wet, go get some perlite to mix-in during the next transplant.

Keep ingoing ph near 6.8 or 6.9 as FFOF tends to be on the low side of acceptable range. Whomever mentioned lowering water ph to 6.0 is wrong. Acceptable ph for peat-based mediums is 6.3 to 6.8ish. Your ph will drop further over time as the buffers in the soil fade, so keeping it a tad on the high end of the range is acceptable and warranted.

Keep your ph consistent to rule-out ph fluctuation as a cause of plant stress. Quality demands consistency.

Unless the medium is pre-fertilized, it's getting near time to start them on 1/2 strength nutes. Which are you going to use?

Rusty Trichome Reviewed by Rusty Trichome on 04-27-2010. Yellow Leafs.. Heat Stess?? CFL Hello guys, ive been reading like there is no tomorrow to figure out what is the problem with my babies... from what i have read and what my babies look like it seems like heat stress... but.. is that even possible with CFL?? atm i have 2 26w 6500k at 3 " from the top of the plants. they where planted on dixie cups, about 2 weeks later their leafs started to turn yellow on the edge, i thought this was a bit normal as new leafs showed up, and they hadn't grown that much, so i decided to Rating: 5

[Bongojaz]

from the pics, the plants have that "overwatered droop." this makes sense since you say you're watering every day. looks like the lower leaves are burned a bit. feed once a week, and let the medium dry up a bit. in between feeds, water with properly ph'd water. since you're kind of using a soilless type mix, i'd drop the ph down to around 6. sounds like your medium is probably pre-ferted, and you've amended it with more. this is fine, but remember when adding nutes to the water, use a reduced rate because of the nutes in the medium. those temps. are a bit high, maybe throw a fan on em.

i miss-read your medium. i thought you were in a mix, my bad.

[Gojira]

Thanks all for the information! ill stop watering them daily and see how they go . about the yellow leaves since they most probably die... should i remove them so the plant doesnt wast energy in those leafs?? ohh and about the soil i am using is Scotts Potting Soil, the pic of the soil is attached :P, and Bongojaz just like you said the soil is pre-ferted says i dont have to worry for 4 months, and in the web page says these are the Fert stats .07 - .01 - .03

[Rusty Trichome]

...about the yellow leaves since they most probably die... should i remove them so the plant doesnt wast energy in those leafs??

I just wait till they fall off at which time I remove them to prevent leaf litter. (bugs love leaf litter). The plant is sucking-out (removing) any remaining mobile elements and nutrients as the leaf dies.

ohh and about the soil i am using is Scotts Potting Soil,

I don't know where the heck I got Fox Farms Ocean Forest from. But regardless, it's along the same lines as Miracle Grow Organic or FFOF. Slow release organics. As with all peat-based mediums, ingoing ph should be in the 6.3 to 6.8 range. I'd still aim for the high-end of the ph range, as the ph will drop over time.