Could use some greenhouse advice

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JacksonH

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Hi,

I want to grow 4 Pennywise cannabis plants in my greenhouse and I could use some advice.

I live in a forest in Southern Oregon, and where the greenhouse is situated it only gets about 4 hours of direct sunlight, from about noon until 4 PM. There are tall trees that block direct sunlight in the morning and late afternoon, and to make matters worse, just about when the plants start to flower and need more light, since the sun is lower, it is blocked by more trees. I grew 4 plants a few years ago without a greenhouse or supplemental lighting and the results were pretty disappointing. Cutting down trees is not an option.

I figure that I will supplement the direct sunlight with either Spider Farmer or ViiparSpectra LED grow lights, 1 light per plant. The greenhouse is 8 feet wide by 12 feet long and has a peak polycarbonate roof. I plan on using a 30 gallon grow bag for each plant.

Does this sound like a good idea? Any advice will be greatly appreciated.

Thank you.
 
MIGrampaUSA

MIGrampaUSA

2,180
263
Hi,

I want to grow 4 Pennywise cannabis plants in my greenhouse and I could use some advice.

I live in a forest in Southern Oregon, and where the greenhouse is situated it only gets about 4 hours of direct sunlight, from about noon until 4 PM. There are tall trees that block direct sunlight in the morning and late afternoon, and to make matters worse, just about when the plants start to flower and need more light, since the sun is lower, it is blocked by more trees. I grew 4 plants a few years ago without a greenhouse or supplemental lighting and the results were pretty disappointing. Cutting down trees is not an option.

I figure that I will supplement the direct sunlight with either Spider Farmer or ViiparSpectra LED grow lights, 1 light per plant. The greenhouse is 8 feet wide by 12 feet long and has a peak polycarbonate roof. I plan on using a 30 gallon grow bag for each plant.

Does this sound like a good idea? Any advice will be greatly appreciated.

Thank you.
How tall is the greenhouse? I hear 30 gallon bags and I'm thinking this guy is growing 20 ft tall trees.. I don't know much about Oregon weather in the fall but I do know plenty about how my greenhouse grows are in a Michigan fall if I allow vegetation up against the polycarb greenhouse panels.

My greenhouse is in full day sun. Michigan falls feature cold damp nights and many cloudy/rainy days making RH related issues a potential problem. Greenhouse "glass" collects condensation that does not burn off during the day. Any vegetation against the glass has potential to introduce bud rot ... and the humidity issues make WPM a potential problem.

Solution - control their size so they cannot touch any side walls or polycarb panels. Plenty of air flow. Filtered intake air. If you can get a handle on those variables, use the 30 gallon bags. My greenhouse is a 10' x 20' x 8' structure. I will run 8 plants. Each in a 7 gallon bag buried in the ground. A 5' to 6' tall plant is plenty big if I want to keep them out of the glass.

Edit: Other than that, the supplemental lighting is a good idea.
 
Last edited:
J

JacksonH

8
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The greenhouse is just over 9 feet tall, side walls are 4 1/2 feet tall.
Sounds like you think that 20 gallon bags are way too big?
 
MIGrampaUSA

MIGrampaUSA

2,180
263
The greenhouse is just over 9 feet tall, side walls are 4 1/2 feet tall.
Sounds like you think that 20 gallon bags are way too big?
I do, yes. Other than that I like your idea.

Edit: Here's why. To make it work, you need to be able to control their size. If you can't control their size, then fall RH issues will be much more likely to occur. Think of growing quality not quantity.
 
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MIGrampaUSA

MIGrampaUSA

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OK, thanks for your reply.
Here's a picture from a few weeks ago of what my greenhouse looks like as we prepare for the summer run. My seedlings are very young and are still indoors.

Work In Progress 2
 
J

JacksonH

8
3
That setup looks pretty good. We are allowed 4 plants per household here in Oregon. When I did my previous grow, the plants were in 20 gallon plastic planters, and as I mentioned, they didn't do that great, so I was thinking that bigger pots were better, but I might be making other problems for myself with 30 gallon pots.
 
MIGrampaUSA

MIGrampaUSA

2,180
263
I'm using fabric pots. I don't know if I specified that. I wouldn't use a plastic pot buried in the ground unless it looks like swiss cheese. Drainage is critical. Also its far from unheard of for roots to penetrate through these fabric pots.

There are many reasons that could have contributed to your issues with lack of light only being one of them. Over-watering is common and can occur even in plants directly in the ground. Once again, that's why I would focus on growing a plant of a size that fits your space. 4 plants kept 6' or under and not touching any glass or side-walls or even the ground should work well in your space. Use landscape weed barrier that allows water to drain through. Use border mulch and landscape stones if you desire, but that's really not necessary. I did that because my wife requested it.
 

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