Very early preflower... Need help...

[canacanna]

Some of the very bottom leaves started dying and the end of some leaves (near top of the plant) started turning brown. What's the problem here? As far as I understand it's nuteburn or heatburn.

They are in the sixth week of flowering. Should I be worried?

Thanks in advance...

[stinkyattic]

Those plants are the picture of health.
You're seeing the problem with a small HPS- the low leaves don't get a lot of light, and will eventually die off. But at week 6 with the tops looking that healthy, you are FINE. Better than fine. Yer golden.

[canacanna]

Thanks @stinkyattic ....

How much time till harvest? Can we guess by looking at those pictures?

[FireTheft]

impossible to tell by those pics, but if I were to guess probably another 2-3 weeks....your pistils still look very white and fresh.
the tips will start to turn brown soon.

you also need to infest in a 30x or higher magnifier so you can look at the trich's that's the only surefire way to determine harvest time.

you're plants are looking SO sweet, don't wait on getting a magnifier!

one question...where did you buy that HPS lamp? it looks kind of small, I'm needing a small one but I can't find anything small

[canacanna]

It's a 70w hps. I found it in an electronic store.

Question: I haven't got a 30x or better magnifier but I do have a normal microscope (up to 300x). Can I take a very small sample so that I can use the microscope? And where should I take the sample from? The pistils or the leaves?

[canacanna]

I've thought of another way to see the trichs. I've used my digital camera to take some shots and cropped the pictures.

Can we tell by those photos?

[Mr. Clandestine]

The trichs still look pretty clear in these most recent shots. When to harvest depends on what kind of high your looking to get from them. More clear to slightly milky colored trichs will give you more of a heady high, while more cloudy to amber trichs will produce a narcotic, couch lock type high. I like to wait until about 15% of the trichs have turned amber, but will harvest a little earlier if the plant is taking forever to mature. (11th week on up...)

[canacanna]

They are in the 7th week of flowering and almost all of the pistils are still white. About that trichome method... Where should I look? The top, middle or bottom part of the main cola? Do they all advance at the same speed?

[Mr. Clandestine]

They are in the 7th week of flowering and almost all of the pistils are still white. About that trichome method... Where should I look? The top, middle or bottom part of the main cola? Do they all advance with the same speed?

You may have a strain that needs more than 8 weeks to finish its flowering cycle. Several of mine take 10 weeks, or sometimes longer. And when you're looking at trichomes, I'd check the top of the colas first, and then compare them to the lower buds that aren't receiving as much light. The colas themselves generally mature at the same rate, but the lower growth ("popcorn buds" - I hate that term for some reason) can take longer to mature. Since the tops sometimes do mature faster than the lower growth, so do a side-by-side analysis to determine when to harvest. And you can harvest just the tops, and leave the rest of the plant in flowering a while longer if you need to. With some of the tops and side branching removed, you're able to get more light to those areas that didn't used to have it.

[canacanna]

Thanks @Mr. Clandestine...

You've been very helpful...