When to start flushing?

Not yet, mate. Still very white pistils and definitely the trichomes are still very milky. Normally the leafs aren't the best way to check the maturity. The best thing that you must buy is a hand microscope and the trichomes tones are the unique way to check the perfect point to end the cycle. Normally if you start to flush now the trichomes will mature fastly along the flush process, but normally my rule to the start of the flush process is to have at least more than 50% of the total of the trichomes passing from yellowish to amber. That ratio is better verifiable with a handset microscope because when you see by the microscope you will find on the view a specific area that amount of trichomes (between the ones that aren't mature yet - normal crystal clear to milky colored ones; the yellowish ones and the matured ones, that are amber coloured. By your photos definitely you should wait at least more ten days. Then you should flush nor more than less than a week, suppose 5 days with crystal clear water and maintaining the PH that you use to the final flowering stage. Normally to flush properly I use tap water, but I left it for 24 hours on the sun and that way the chlorine compounds on the tap water are eluriated. Then I normally use as flush agent the T.A ( Terra Aquatics) Flash Clean (Flora Kleen) due to be a agent with a amazing cost and to be an flushing agent that doesn't attack the agents of living soil such as mycorrhizae, soil bacteriae or trichoderma and by that way you can flush the soil without altering the EC and the soil agents needed for a next time. Best of luck. TOM

From the flushing study: The study examined the impact of various flushing durations on the taste, chemical composition, and smoking quality of the Cherry Diesel cannabis strain. We tested the effects of 14, 10, 7, and 0 days of flushing cannabis plants. It’s interesting to note that even in this cannabis flushing research study, there still is no clear indication of whether you should flush cannabis plants and the impacts it has as a result. Rx Green’s cannabis flushing study showed no major differences in the results of flush treatments for cannabis nutrient systems. Source: https://www.rxgreentechnologies.com/rxgt_trials/flushing-trial/

Well, if you know what you want them to look like, you wait until they look like that. Time will vary per plant and garden. can't see how it progressed, but should have adjusted the things you were doing when all that damage started. could be a calcium deficiency and other things, not 100% certain. So you may need to reduce some things but it clearly wasn't getting enough Ca or something else was locking it out. You should continue to give what a plant needs... if you want to save a little time or effort, giving water only at end with a strong enough canopy that won't limit photosynthesis too much is fine too.

Nice looking grass. You could definitely flush your handy. Your organic too so should get a little buffer on stuff too. Nobody likes black ash

Hey there your plants looking great It seeks like you have a serious ph problem with those spots all over the leaves. I think you should get a reading on some run off water and if its 2 low then just run a few gallons of tap water with ph 7 to 8.8 I would not really even start checking tricombs untill you see about 70% the hairs change on the entire plant... Make sure you are only checking tricombs that are directly hrowing from the flower and not from any small sugar leaves hidden in there. The ones on leaves change way b4.

Also. Sort out with pk, calcium etc. A lot of issues mate.

Mate. Flushing. 1st is a myth. Just stop feeding the week before and allow the plant to finish whsts left in the pot But your plant is at least 10-15 days out. And even then I'd say that's early Don't be to quick to harvest. Your close but you need to keep going for a few more