When to Harvest?

I dont have a microscope at the moment, I started flushing for around a week as I thought instructions would be pretty accurate but have just added 1/4 feed again

Hey mate... probably you still have around 3 weeks until harvest... that's based on the pistils, do you have any pics of the trichomes though ?

About abother 14 days up to Mabey 21

Thanks for advice, I will give it 2 weeks and see how it goes

3-5 weeks. Never trust manufacturer dates. So many things can change the length of time. The yellowing leaves could be normal if it's just a few. Otherwise, you may be using too much bloom nutes or completely cut out nitrogen. It still needs a bit of N and bloom boosters tend to be too much.

Should I be worried about the leaves yellowing already? I thought it was because the plant was coming to an end but I must be wrong

I'd say about 3 more weeks and she'll be right were you want her be for harvest. Nice looking plant by the way