When does flowering start

At 12/12 flip, flower is initiated and you are in pre-flower (I keep mine there 2 weeks) I then start Flower and start feeding according the schedule I follow. Guideline for time frame length can be judged by strains flowering time. Of course in reality plants are ready when they show you.

I count it when I switch the lighitng scheule to 12/12 or w/e i use. Someimes 11/13 But its your diary and you can do w/e you want with it. No set standards or rules here. Its nice.

Cannabis plants begin flowering indoors when the light cycle is reduced from 18 hours of light per day to 12 hours. This mimics the natural light cycle during the growing season. After switching to a 12/12 light cycle, cannabis plants will start to grow preflowers within 2–3 weeks. After about 21 days, the plants will stop stretching and focus on flowering. From week 4 onwards, the plants will develop calyxes.The appearance of small, white hair-like structures called pistils on female plants. Normally 7-10 days after I switch I'll notice hairs one morning and that's normally my 1st day. Works well enough although there is no harm in doing your own thing, technicalities. No one can tell you accurately how long a flower takes as its based on alot more conditions than simply staying a timeframe then sticking to it no matter what. it started. 50 days, 60 days, 80 days, ready when it's ready. Always bake my apple pies longer than I should its just me.

https://www.growweedeasy.com/flowering-stretch Planning for the Flowering Stretch Planning for a stretch is easy to do when you know it’s a possibility. There are two things growers can do that will give a lot of control over planning for a potential stretching situation: Research your strain If you know what strain you’re going to grow, you can usually find its growth characteristics online. Seedfinder.eu is a pretty good resource for reviews on strains submitted by other growers. While it isn’t necessarily 100% accurate (what is?), it should give you a good range of what to expect. Knowing the strain you’re growing gives you the power to decide how much stretch you’ll deal with. Since stretching is often accompanied by a ‘tall’ final height, you can reduce stretch by getting plants that are characterized as being ‘medium’ or ‘short’. Plan for a tall plant In my opinion, the best way to be prepared for any stretch is to simply plan out the space as if you know that your plant will double in height by the end of flowering. Don’t worry, it’s much easier than it sounds! Here’s how you do it: 1 Take the total amount of vertical (height) growing space you have in inches/cm. 2 Take the total from #1, and subtract the height of your lights when it’s at its highest point. 3 Next, subtract the height of the pot/container your plant will be in. 4 Finally, subtract the amount of space you’ll need between your light and your plants. 1 This varies depending on the lights; CFLs only need about 4″, HIDs need 12+”. 5 When your plants height reaches half of the number you’re left with, initiate flowering!

Around 10 Days usually

There is a plethora of amazing answers expounding on this topic. Breeders will use the numbers to get the lowest time possible on packaging. In your garden, a good rule of thumb is when you flip to start counting immediately. The next ~3 weeks are "pre-flower" followed by ~6 weeks flower depending on a number of other factors. Technically it starts the day you switch, as the hormones will begin their role. At the scale of human eyes, you won't see much until the end of pre-flower.

When I see pistils, usually it takes about two weeks after the switch, good luck growmie