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When cannabis plants start to mature, they also go through a brief transitional period; a sort of cannabis-puberty if you will. And just as humans undergo a burst of rapid growth, cannabis plants will also create a large portion of their final height in a very short period of time. This explosion of vertical grow this commonly called the cannabis ‘Flowering Stretch’.

What is the Flowering Stretch?
The best way to give you an idea is with pictures. Here’s a cool animated .gif Nebula made showing the flowering stretch in action.

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What to Expect
A seedling stretching its heart out!Depending on the strain you’re growing, you can expect a pretty wide range of stretching. Some strains can double their height or more, while some do almost nothing. However, if you know the name of the strain you’re growing, you can look up the breeder recommendations to get a good idea of what might happen. Additionally, there are other factors that can give you insight:

Sativas – Sativas tend to grow taller, lanky stems even when trained; inch-for-inch they tend to stretch much more than indicas.
Strain height – Many breeders and seedbanks have the average height of their strains listed. Sometimes it’s as vague as “short – medium – tall”, but even that is enough to give you an idea of its growth characteristics. Expect "tall" strains to stretch!
Light type – Certain light types are more conducive to stretching than others. You can use the right light color spectrum to help control growth characteristics. More on that later…
Light distance – Plants also stretch when they're trying to get more light (like this plant to the right). As a result of this type of stretching, plants grow taller, but with fewer bud sites. Note that this is not the same thing as the flowering stretch, rather it's a symptom of too-little light. Most growers want to avoid stretching caused by not enough light as fewer bud sites means less bud.
One of the main reasons it’s so important to know about stretching is that it can rapidly reduce the amount of space you have in your grow tent/area. If you’re growing in a space with limited height, a good stretch can make it so you no longer have room to raise your lights. This leads to light/heat stress and lost buds.

I personally had a stretch where there was no longer any room to raise the lights. I used a CFL/LED combination at the time, and the LEDs absolutely cooked the buds underneath it until I got desperate and cut the stuff that was too close. I would handle that situation differently now, but it shows that no one is immune if they’re unaware.

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Rider420 said:
That is a very healthy looking plants how tall are they? Cannabis does not stretch until flowering here is a good link to find out how tall your plants will get. Those sativa are going to at least double if not triple in height unless you are topping and training.

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When cannabis plants start to mature, they also go through a brief transitional period; a sort of cannabis-puberty if you will. And just as humans undergo a burst of rapid growth, cannabis plants will also create a large portion of their final height in a very short period of time. This explosion of vertical grow this commonly called the cannabis ‘Flowering Stretch’.

What is the Flowering Stretch?
The best way to give you an idea is with pictures. Here’s a cool animated .gif Nebula made showing the flowering stretch in action.

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https://www.growweedeasy.com/flowering-stretch

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What to Expect
A seedling stretching its heart out!Depending on the strain you’re growing, you can expect a pretty wide range of stretching. Some strains can double their height or more, while some do almost nothing. However, if you know the name of the strain you’re growing, you can look up the breeder recommendations to get a good idea of what might happen. Additionally, there are other factors that can give you insight:

Sativas – Sativas tend to grow taller, lanky stems even when trained; inch-for-inch they tend to stretch much more than indicas.
Strain height – Many breeders and seedbanks have the average height of their strains listed. Sometimes it’s as vague as “short – medium – tall”, but even that is enough to give you an idea of its growth characteristics. Expect "tall" strains to stretch!
Light type – Certain light types are more conducive to stretching than others. You can use the right light color spectrum to help control growth characteristics. More on that later…
Light distance – Plants also stretch when they're trying to get more light (like this plant to the right). As a result of this type of stretching, plants grow taller, but with fewer bud sites. Note that this is not the same thing as the flowering stretch, rather it's a symptom of too-little light. Most growers want to avoid stretching caused by not enough light as fewer bud sites means less bud.
One of the main reasons it’s so important to know about stretching is that it can rapidly reduce the amount of space you have in your grow tent/area. If you’re growing in a space with limited height, a good stretch can make it so you no longer have room to raise your lights. This leads to light/heat stress and lost buds.

I personally had a stretch where there was no longer any room to raise the lights. I used a CFL/LED combination at the time, and the LEDs absolutely cooked the buds underneath it until I got desperate and cut the stuff that was too close. I would handle that situation differently now, but it shows that no one is immune if they’re unaware.

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Thanks, i LST'd the crap out of them.. the durban grew at a night pace.. the herer never really took off but is healthy and has good new growth lately.. they are maybe 16" tall over the pot, i need to measure them. The durban has at least 20 tops going though, really happy with how it grew, i just hope it's a solid strain cause i wouldn't mind growing more of it

P.S. i think the shortness might be cause i had my lights very close (i actually was seeing how close i could get without dmg, which ended up like 6" and 105k lumens.. i recently moved them up to like 12")