when to flower

J

jman23

Active Member
im running a 400 watt hps room size is 3x3x6 running 4 plants at what height should i flower to get a 3ft plant plants are about 9" or 10" now
 
Sunbiz1

Sunbiz1

Well-Known Member
This varies tremendously by strain, but the general rule of thumb is 50% increase in height after flipping. So if the plant is at a 20" height, it should wind up around 30".
 
J

jman23

Active Member
hmm alright thanks i was told to flower at 12" to achive 3 feet so your saying flower at 20 that seems big
 
T

tibberous

Well-Known Member
jman23 said:
hmm alright thanks i was told to flower at 12" to achive 3 feet so your saying flower at 20 that seems big
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Keep in mind that everyone growth rate is going to be different. 2 months in hydro won't be the same as 2 months in soil.

Less important than getting it right this time, is to keep track of how big they were when you went 12/12, so next time you can adjust. You might want to look at topping too if you aren't already - helps the plant fill out the space better.
 
kryptoniteglo

kryptoniteglo

Well-Known Member
madmonk said:
Bare in mind that a sativa will usually double in height where as an indica will go 50% more.
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Ditto. My sativa-dom 60/40 plants actually tripled. I had to run out and get a tent that's a foot taller just to keep from burning the top colas.

And don't forget to subtract the pot height and light space from the total tent height -- In a 6-foot grow tent subtract 8" for both light and pot (or more for the pot if you're running hydro). That's at least a 16" loss right there. Then you need 14" in general for the space between light and plant (though mine are now 8" below and don't care). So you're losing about 25-30" to the set up.
 
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