What flowering and harvest period mean exactly?

Hello guys!
I wanna ask something i haven't figured out yet unfortunately!
I was searching for some seeds and I saw most of them had their own harvest and flowering period.
What does this mean exactly?
I mean if a specific kind of seeds flowering period is 8-9 weeks and the harvest period is at early september, just like "Caramelicious" do I have to plant the seeds 8-9 weeeks before september? (that would mean I should plant it late june to early july)
Just in case it matters, I am interested on outdoor planting (one or two plants in the balcony or terrace) in a mediterranean climate!
Moreover, once the plant gives its first weed, will the next one be in 8-9 weeks period?

Excuse me if I make silly questions, but I thought maybe i am getting this all the way wrong so I had to ask!!!
thanks guyz

I usually dont go by what a company claims but usually if it says 8-9 weeks flowering period then once your plants preflower, or sex with little hairs for the ladies and balls for the boys, 8-9 weeks from then your buds, if a lady, will be ready for harvest but like i said dont get disappointed if it takes a little longer than what the companies claim as there are variables that they dont mention. 8-9 weeks is their fastest pheno under the best conditions. good luck

Thats ok, i mean i wouldn't be dissapointed if I had to wait more for the plants to grow and harvest, but my main question is, can I start planting at this period of the year or I will have to wait until june/july?!!! Cause that will most certainly kill me

Depends on where you are in the world. Outside she'll need plenty of time in growth, before the light naturally flips her into flowering late autumn....I've always assumed if a seed bank says "late september" etc for harvest they're talking about a spring planting outside....And 8/9 weeks flowering is fot growing indoors from time of light flip..?

To answer the question, in the Northern hemisphere, ordinary plants grown outside are usually ready for harvest in late September or early October, depending on the strain. Some earlier strains could be ready in early September.

The 8-9 weeks flowering time the seed-sellers suggest usually is counted from the time the plants start making flowers, not from the time the seed is planted. As mentioned, realistically it might take another 1-2 weeks longer than the seed-sellers suggest before the plants are really ready. Before a seed is ready to start flowering, it has to germinate (a few days), then establish sexual maturity (3-4 weeks).

So realistically, if you want to start from seeds you should probably add another 4 weeks to your time estimate. 12 weeks from mid-September means that in practice, you'll probably want to plant your seeds no later than mid-June. Starting them earlier would mean that the plants would grow larger before flowering, and hopefully end up larger at the time of harvest.

Moreover, once the plant gives its first weed, will the next one be in 8-9 weeks period?

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I don't think you understand.

The plant starts as a seed, then grows and makes leaves. As the summer turns into autumn and the hours of daylight become shorter, the plant stretches in height and begins to make flowers. Once dried, the flowers, of course, become the marijuana you want. Generally you only harvest the flowers once, because after that winter comes and the plant dies. Normally, you will not be able to get more than one harvest from an outdoor plant.