Plant almost ready to harvest

This plant is about to turn 5 months old on June and the weed has been growing for about 2 weeks. It is in a 3:1 combination of soil with pearlite. After its 1st month I started watering it with fertilizer (25-10-10) once every 2 weeks, did this for February and May. Since those 4 times I have added no more fertilizers.
The leaves have started to get burned at the tips about 1 month ago. The only significant change that has happened is less sun (10hours only and cloudy) and more humidity (70%) due to winter, I'm not sure if that can cause the leaf burning and the yellowing.
Besides that, I'm not sure when to start harvesting. Can I leave it more time so more weed can keep or growing or could I also start loosing weed since the plant is getting week with the climate change?

its not done yet you can still grow with only 10 hours of sun light.I'd say let that girl go at least 3 more weeks.feed in some flowering nutes something high in P and K and low in N so like N 1% p 4% k 7% as long as the P & k are higher then the N your good to go then you should flush it with straight water good luck with your beautiful plant let it grow longer DONT cut her down yet....do you know the strain?

But wouldnt adding fertilizer so close to the harvest change the weed's flavor? Or what about adding a natural fertilizer such as guano, would that be less harsh on the weed?

psangangs said:

But wouldnt adding fertilizer so close to the harvest change the weed's flavor? Or what about adding a natural fertilizer such as guano, would that be less harsh on the weed?

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And is it possible for the weed to start disappearing if I leave it for too long since the leaves are also falling out?

look at the trichs like that dude said. i go for a mix of cloudy and amber. another decent way to tell is to look at the hairs if a vast majority (80-90%) have changed from white to another color red,orange or whatev i would say harvest that shit. i can't really tell from the pic. Looks like mostly sativa so its probably got a long flowering period (10-13 weeks). Pot does have a prime harvest period though that after which thc will start to degrade.