Supplement the sun with HPS during late fall

I'm growing outdoors and I have a few plants that got a late start. They won't be done flowering until mid November. Can I keep them outdoors during the day (in a heated greenhouse if necessary) and then supplement them by putting them in a shed with hps lights for another few hours? Would this give them enough light to grow nice and big and normal?
 
Yes but it's a fuck ton of work.....
Greenhouse is right next to the shed. It'll just be a matter of going outside at sundown and putting them in the shed with hps on a timer for about 2-3 hours I guess. But in your experience would this work ok? They say 5 hrs of direct sunlight a day is enough. But that's sunlight and not a grow hood so I'm not sure if it's the same? Here's a question...... with the greenhouse keeping the plants safe and allowing sun, would I even have to supplement the lighting? Just let them go outside until they're done? As long as they're getting 5 hrs direct sun?
 

Stiickygreen

Well-Known Member
As always with growing pot....more light is usually optimal. I would probably give them their 5 hours of sun and then do as you say...carry them in and give them more inside. The light from an HPS will be far better than indirect light outside, IMO.

best of luck with the finish!
 

chemphlegm

Well-Known Member
they need 12 hours of darkness. thats all you need to think about.
yes, plants grow under the sun. they also grow under grow lights.
greenhouses often use grow lights inside in order to lengthen day light hours.
more light is better, sunlight is better than grow lights. greenhouse sunlight
is many times more powerful than any grow light.
 
As always with growing pot....more light is usually optimal. I would probably give them their 5 hours of sun and then do as you say...carry them in and give them more inside. The light from an HPS will be far better than indirect light outside, IMO.

best of luck with the finish!
Thank u. U make a lot of sense.
 
they need 12 hours of darkness. thats all you need to think about.
yes, plants grow under the sun. they also grow under grow lights.
greenhouses often use grow lights inside in order to lengthen day light hours.
more light is better, sunlight is better than grow lights. greenhouse sunlight
is many times more powerful than any grow light.
Ok. Another quick question as I could save a few bucks. I currently have a 4 foot t-5 hood with veg lights. Could I use this to supplement my flowering girls during early November or do I have to get the flowering t-5 or an hps hood? I mean it'll only be about two weeks and any sunlight should help right? Or no because it's a different light spectrum?
 

chemphlegm

Well-Known Member
never mind the spectrums, just carry on with the lights you have making sure they get 12 hours of darkness.
t5 with sun and hid light will be superior to t5/hid only.
 

waterproof808

Well-Known Member
I'm growing outdoors and I have a few plants that got a late start. They won't be done flowering until mid November. Can I keep them outdoors during the day (in a heated greenhouse if necessary) and then supplement them by putting them in a shed with hps lights for another few hours? Would this give them enough light to grow nice and big and normal?
Cant you just hang the HPS lights in your greenhouse? That way you dont have to move them every day and you'd still be using the available sunlight.
It is a common fallacy amongst cannabis growers that "a cloudy day is better than any indoor light" and that is simply false.
 
Good well built and wrapped greenhouse will stay warm into November..
I thought so. I've also got a bunch of clear gallon jugs filled with water all over in there holding some btu's keeping it even warmer. I'm just hoping there's enough sun in a day in November so she can grow ok. Maybe I wouldn't even have to supplement the light at all?
 
Cant you just hang the HPS lights in your greenhouse? That way you dont have to move them every day and you'd still be using the available sunlight.
It is a common fallacy amongst cannabis growers that "a cloudy day is better than any indoor light" and that is simply false.
Neighbors. I'm country but if I have lights on at dusk or at night outside it'll draw attention to that area. I'm probably fine but just being extra careful. Neighbor is a hunter so he will be walking within a hundred yards of this area at dusk a lot pretty soon.
 

chemphlegm

Well-Known Member
Cant you just hang the HPS lights in your greenhouse? That way you dont have to move them every day and you'd still be using the available sunlight.
It is a common fallacy amongst cannabis growers that "a cloudy day is better than any indoor light" and that is simply false.
if its common among growers, and its false....
you should prove that, just saying.....:confused:

for now....I'd take a year of cloudy days over a pounds per watt hid comparisons
 
if its common among growers, and its false....
you should prove that, just saying.....:confused:

for now....I'd take a year of cloudy days over a pounds per watt hid comparisons
I'm hearing you. A cloudy day that's 100 percent cloudy all day would be considered a day that has zero indirect light tho right? And cannobis needs at least 5 hrs of direct sunlight per day correct? This is where I get confused.
 

chemphlegm

Well-Known Member
I'm hearing you. A cloudy day that's 100 percent cloudy all day would be considered a day that has zero indirect light tho right? And cannobis needs at least 5 hrs of direct sunlight per day correct? This is where I get confused.
I really dont know but am interested in seeing the numbers.
 
I really dont know but am interested in seeing the numbers.
Me too. We talk about 12 hrs darkeness. Well 3 of my plants started to flower on their own here in Michigan on august 10th (almost finished) but the sun was out a lot. I believe up here at that time there was about 10 hrs of direct sunlight with a good 14 indirect so I don't know how the plants went into flower as everyone says u need 12 hours darkness but no matter what calculator I use on august 10 up here there wasn't 12 hours of darkness. Very contradicting it seems. Now these plants had been seed popped and were large on aug 10 don't get me wrong. Had I been growing indoors I would've sent them into flower on my own around that time anyways but the point is that I didn't but yet they still flowered on their own with all that light.
 

Stiickygreen

Well-Known Member
No contradictions. You just need to learn more about how/why these plants flower.

Cannabis plants are short day plants...meaning they recognize the diminishing light as well as the total daylight they receive. Any cannabis plant outside long enough in diminishing light (per day) will likely flower. 12/12 is just the indoor flip gig. Plants can and do flower with far more light per day than 12 hours. Mine are in full flower and I noticed the lightness in the tips (starting to flip) July 25th. The webpage says we have 13 hours and 7 mins of visible light right now....and it was right at 14 hours per day when they went into flower. Were you really expecting them to stay in veg outdoors in September?

Either way...good luck with the finish.
 
No contradictions. You just need to learn more about how/why these plants flower.

Cannabis plants are short day plants...meaning they recognize the diminishing light as well as the total daylight they receive. Any cannabis plant outside long enough in diminishing light (per day) will likely flower. 12/12 is just the indoor flip gig. Plants can and do flower with far more light per day than 12 hours. Mine are in full flower and I noticed the lightness in the tips (starting to flip) July 25th. The webpage says we have 13 hours and 7 mins of visible light right now....and it was right at 14 hours per day when they went into flower. Were you really expecting them to stay in veg outdoors in September?

Either way...good luck with the finish.
I actually did expect them to veg until the first or second week of September. In fact here in Michigan that is the rule of thumb that is followed. I think I'm understanding the diminishing light/short day concept, it means that with diminishing light (with at least 5 hrs direct light) the plants genes will eventually flip it to flower as they're "body" is ready?
 
I actually did expect them to veg until the first or second week of September. In fact here in Michigan that is the rule of thumb that is followed. I think I'm understanding the diminishing light/short day concept, it means that with diminishing light (with at least 5 hrs direct light) the plants genes will eventually flip it to flower as they're "body" is ready?
What area of the country are you in?
 
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