Concern about discolored leaves - thoughts?

[Sperocles]

just in the last day or two these leaves have started getting reddish/brown on tips and around edges. I've inspected the buds and they all look healthy - no brown growth and nothing that looks like mold spores. They've continued to get nutes every other watering - FoxFarms Trio at half strength (Big Bloom 1.5tsp/gal, Grow Big 1tsp/gal, Tiger Bloom 0.5tsp/gal). They were also flushed for the first time a week ago - Fox Farm Sledge Hammer 2tsp/gal. I've been dealing with heat and humidity challenges - according to my GrowHub, over the last month temp has averaged 80 degrees F and humidity has averaged 60%. They're planted in soil (5gal fabric pots) in a 2x4 tent with 200W LED light at 75% intensity.
Anyone have thoughts about what this might be, if I should be concerned, and what I can do about it?

[alltatup]

Sperocles I'm not sure what's causing the yellow/brown colors, but nobody knows your growing conditions better than you. Check out these pages and you will find the solution.

yellow leaves: https://www.growweedeasy.com/why-cannabis-leaves-yellow
nute burn: https://www.growweedeasy.com/cannabi.../nutrient-burn
solve many diff. problems: https://www.growweedeasy.com/5-step-...owing-problems

[golfnrl]

Hello Sperocles you're at the right place. I'm assuming the PH is in range for soil? It appears the coloring is also down in the lower part of the plant? Have you clicked on the Plant Problems tab at the top of this page? There's a bit of debate on the forum about late stage flowering and what that looks like. Yellowing leaves all over the plant in the flower stage could be a potassium or phosphorus deficiency. It could be the plant taking the nutrients it needs from the stored energy in those leaves. What do the trichomes look like? There's nice a frost all over the buds. How far along in the flower stage are ya?

[Sperocles]

I found some info on SeedFinder about two of the parent strains (Sour Punch and Zour Apples), but I couldn't find anything here about my specific strains. Both of these parents have a +/- 60 days flowering period. I also couldn't find anything on the other parent strain (Grapes & Cream). Guess I'll need to be watching those trichomes and pistils closely.

[golfnrl]

I currently use BlueLab PH equipment. Very accurate. I have also used Hannah PH pens. There's lots of brand options but you get what you pay for. Some on the forum use PH test strips. You're right to check out the seed suppliers site for specific grow information. I see what you mean about the lack of info on the Trilogene web site. Next best option is also what you've done. Knowing the flowering time period, even when understanding these guides are made under laboratory conditions, can be helpful. It looks like you're close to the 8 week time period of the parents. And yes, watching the trichomes and pistils is the only way to go. Do you have a jewelers loupe? How are you examining the trichomes?

[Sperocles]

Yes, using a jeweler's loupe to examine the trichomes

[dirtymike]

Looks like a nice fade, close to smoke time. Water, watch and ditch the bs meter. All's well, let's get high.

[Bluey]

Throw that meter away.

Stay the course. Keep doing what your doing.

Why did you flush the soil? How long after flushing the soil did the leaves lose color?

[Sperocles]

I'm following the Fox Farms Soil Feeding Schedule and was at the point of it recommending a flush. The brown/red edges began around 5 days after the flush.

[Rwise]

That so called PH meter was meant to sell not use, toss it and get a real one.
The fade is luvely, plants eating their leaves for the nutrients that was washed out of the soil.

[Sperocles]

Rwise, thanks for explaining fade. Now I am unsure if you are being serious or sarcastic. Is losing freshness or brilliance of color a good thing or bad thing in this case? dirtymike said "looks like a nice fade" so I thought you both were suggesting this fade was good. Thanks for helping me learn here.

[Rwise]

I am watching for the fade in 2 of my girls now, time to start reading the trics!
Not being sarcastic at all. It is also different inside compared to outside, I have seen it called LED light fade and cal/mag recommended.

[Bluey]

That so called PH meter was meant to sell not use, toss it and get a real one.
The fade is luvely, plants eating their leaves for the nutrients that was washed out of the soil.

Exactly. Goodbye nutes

[Rwise]

to lose freshness or brilliance of color

[Sperocles]

Bluey, while it appears you are correct about a recommended flush a couple weeks prior to harvest, I didn't think I was at that point. The flush I was performing was the one to start week 8 according to the chart, which is where I estimated I was in the grow/flowering schedule (4th week of flowering). Maybe I'm further along than I thought. I switched to 12/12 on April 15. First flowers I noticed appeared around April 28 - probably started earlier and I just didn't recognize them as flowers at that point. I've read stuff (maybe at FoxFarm, maybe here) that periodic flushes are recommended to mitigate nutrient buildup around the roots. Since I've only been delivering 1/2 strength nutes (again, something I read) maybe those periodic flushes are unnecessary. Hopefully, I'm learning and the my second and future grows will be even better. I appreciate your feedback.

[Bluey]

The problem with flushing soil grows is you wash out the nutes and the microbes that make the nutes in the soil, so when you are using liquid nutes to suppliment the nutes that the soil produces naturally you run into a bit of a dilemma how best to manage it regarding salt build up in the medium.

Flushing is pretty drastic, a little bit of runoff now and again is probably all she needs. I grow in coco and only give runoff twice a week at about 20% and that works pretty well. I have flushed a couple of grows between transitioning from veg to flower nutes but I don't like doing it as it stresses the plant and I don't think it's needed as I've gone without doing it without a problem.

If you stuff up with the nutes flushing is the answer most times to give yourself a clean start.