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how long to grow a marijuana plant from seed

Even if growing outdoors, a lot of growers will start their seeds inside under an artificial light to help them through this delicate stage of marijuana growth.

It’s important to know these stages and how long each lasts to know what the plant needs and when. Knowing where your cannabis plants are in their life cycle will dictate when to prune, train, and trellis your plants, and when to harvest.

Marijuana light cycle: indoor—16 hours a day; outdoor—at least 6 hours of direct sunlight (“full sun”), plus several hours indirect sunlight

Seed germination

The vegetative stage of cannabis is where the plant’s growth truly takes off. At this point, you’ve transplanted your plant into a larger pot and the roots and foliage are developing rapidly. This is also the time to begin topping or training your plants.

If you buy a clone from a grower or breeder it will be a seedling, so you can skip the seed germination phase.

Marijuana light cycle: 16 hours a day

Within the flowering stage, there are three subphases:

Moreover, the growing techniques you use will also determine the length of your veg; if you’re growing in a SOG, with many small cannabis plants grown together in close proximity, you will usually initiate flowering much earlier. With other training techniques like topping, plants need time to recover from such “high stress” treatment, and therefore veg is lengthened by a week or more.

• Vegetative stage
Time: 2–8+ weeks

3. Vegetative stage (2–8+ weeks) – The vegetative stage could last indefinitely if we’re talking photoperiod (non-autoflowering) strains. Most growers let their plants vegetate for a month or two, or until their plant has a reached a certain size. Bigger plants can mean bigger yields, but how long you veg depends on available growing space.

PREPARATION TIME BEFORE YOU GROW

Germinating your seeds is the first “serious” step when growing weed. If something goes wrong with germinating, such as low-quality or old seeds that won’t “pop”, there won’t be much to grow after all. But you needn’t worry if you get your seeds from RQS, as our cannabis seeds are among the best-quality specimens on the market with the best germination rates.

Following a short pre-flowering stage where some plants stretch significantly in length, your plant will stop vegetative growth and put all its energy into producing what you planted it for in the first place: big, juicy, aromatic buds!

Now that you have an idea of how long it will take to grow weed indoors, we can start to break down some of the specifics so you can get the most out of your operation.

2. Seedling stage (10–15 days) – The “baby-phase” of your freshly sprouted cannabis plant.

Outdoors, the shortening days tell the plants to begin flowering. Indoors, you shorten the amount of time you leave the lights on, going from 18 to 24 hours of daylight down to 12. Or, if you are using an unusual lighting schedule for vegging, like 6 hours on and 2 hours off, going from that to 12/12.

If you provide your plants the perfect conditions, they will grow faster, and produce buds faster as well. This means you need to give them the right type of lighting (quantum board LED lights from HLG are perfect; if you are on more of a budget, check out Spider Farmer), a good growing medium, the right amount of water and nutrients, and the right temperature and humidity.

Time Required: at least 3 weeks

If you are growing indoors anyway. Outdoors, you have to rely on the natural changing of the seasons.

Let’s break the time it takes cannabis to grow down into the different stages, so you can get a better idea of how long each stage takes.

You should cure your buds for at least 2 weeks, but ideally a month or more. Drying generally takes a week to 10 days, though you could do it in 4 or 5 days.