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 Post subject: Buying a Greenhouse
PostPosted: Thu May 19, 2016 7:05 pm 
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Joined: Tue May 22, 2012 10:28 pm
Posts: 277
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Location: Burlington, Ontario, Canada
Finally took the plunge and bought a greenhouse. I've never grown in one but have grown Phals by the hundred for years indoors under lights.
Any tips anyone wants to share?

how do you guys keep your humidity up?
Do you automatically water your plants?
What shade % do you use?

Greenhouse is a 8x12 cedar

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 Post subject: Re: Buying a Greenhouse
PostPosted: Thu May 19, 2016 11:08 pm 
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Joined: Thu Apr 18, 2013 6:39 am
Posts: 760
Location: Davis, CA
Yay! I'm sure your phals will love it.

One day, I hope to be able to get a gh..

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 Post subject: Re: Buying a Greenhouse
PostPosted: Sun May 29, 2016 5:20 am 
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Joined: Fri Oct 24, 2003 7:28 pm
Posts: 1121
Location: North Texas
I use 70% Svensson shade cloth on my cedar house. Farmtek sells it online.

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 Post subject: Re: Buying a Greenhouse
PostPosted: Sun May 29, 2016 5:22 am 
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Joined: Fri Oct 24, 2003 7:28 pm
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Location: North Texas
How hot will your summer get? Ground moisture helps keep up the humidity.

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 Post subject: Re: Buying a Greenhouse
PostPosted: Sun May 29, 2016 5:34 am 
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Joined: Fri Sep 17, 2010 7:52 am
Posts: 309
Location: Oak Island, NC
The required shade level in southern ON and northern TX will be ENTIRELY different. The best thing you can do is talk to other greenhouse growers in your area and see what they use.

In my opinion, Aluminet is the best shade cloth available.

A pigmented shade cloth (most are black or green, I've occasionally seen white) blocks the light through reflection and absorption. The darker the color, the greater the absorption, which naturally means it is converted into heat. That's why it is recommended that shade cloth be elevated from the exterior greenhouse covering.

Aluminet is aluminized Mylar, which does almost all of its blocking by reflection, and it generates very little heat.

I don't know about Canada, but the best price on Aluminet is at Gothic Arch Greenhouses in Mobile AL.

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 Post subject: Re: Buying a Greenhouse
PostPosted: Sun May 29, 2016 5:46 am 
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Joined: Tue May 22, 2012 10:28 pm
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Location: Burlington, Ontario, Canada
Summer can get very hot, 30c +.
I was thinking of installing a misting system or a fogger.

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 Post subject: Re: Buying a Greenhouse
PostPosted: Mon May 30, 2016 6:25 am 
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Joined: Fri Sep 17, 2010 7:52 am
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Location: Oak Island, NC
In an enclosed space such as a greenhouse, if you mist or fog, the relative humidity spikes almost immediately, which slows evaporation, rending the cooling effect useless. All you end up with is a bunch of wet plants in an idea environment for pathogenic fungi to grow.

If, on the other hand, you draw outside air through the structure, and that fog is injected into the incoming air, it will evaporate and cool the interior. While that reduces the wetting of the plants downstream, it doesn't eliminate it altogether, which is why many folks rely on a wet wall or swamp cooler for that purpose.

Also, for most phal species and their hybrids, I wouldn't be too concerned about 30°C, or higher - as long they're in sufficient shade.

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 Post subject: Re: Buying a Greenhouse
PostPosted: Mon May 30, 2016 3:06 pm 
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Joined: Tue May 22, 2012 10:28 pm
Posts: 277
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Location: Burlington, Ontario, Canada
I wasn't overly concerned about the heat. But the misting and fogger was mostly for the winter when the heater would be on almost non stop. The summer weather here is very humid so I would not expect the fogger or misting system to be on much in the summer.
Ray I do like the idea of injecting in the incoming air.

So does anyone automatically water? Or are you all had watering

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 Post subject: Re: Buying a Greenhouse
PostPosted: Tue May 31, 2016 6:22 am 
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Joined: Fri Sep 17, 2010 7:52 am
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Location: Oak Island, NC
Before I retired, I had a 50-mile commute, leaving at 6 a.m., so the concept of going out to the greenhouse at 5 a.m. to water was a drag.

In the greenhouse, I use RO water, propelled by a shallow-well pump. In addition to the ability to hand water, I put a tee in the line, and installed a solenoid valve, controlled remotely via a radio frequency controller, similar to a garage door opener. That was plumbed to overhead PVC pipe containing several spray nozzles.

So...I could stand in my home office window with a cup of coffee, push a button, and it would "rain" in the greenhouse.

Doing that early in the day, and with the HAF fans running, everything was watered well, but dried off quickly enough that I had no rot issues.

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 Post subject: Re: Buying a Greenhouse
PostPosted: Tue May 31, 2016 5:13 pm 
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Joined: Tue May 22, 2012 10:28 pm
Posts: 277
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Location: Burlington, Ontario, Canada
Funny I'm in the same exact boat. I leave for work at 530 and work 60kms away. I'm also not looking forward to watering at 4 in the morning especially in the winter.
Did your haf fans run all day? Since I currently water by hand I have mixed substrate for my phals do you suggest switching medium to something more uniform.
Do heat activate hatch openers work? Mine is coming with two and wondering if they are trusted worthy?

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 Post subject: Re: Buying a Greenhouse
PostPosted: Wed Jun 01, 2016 5:58 am 
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Joined: Fri Sep 17, 2010 7:52 am
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Location: Oak Island, NC
Over time, I adjusted the potting medium/container combination for each plant, ultimately arriving at a point where everything could be watered at the same time with no issues. I'm talking everything from baskets containing no medium to plastic pots of sphagnum, and everything you can think of, in between.

Yes, the fans run 24/7.

While I cannot vouch for every brand out there, the heat activated openers worked great for me.

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 Post subject: Re: Buying a Greenhouse
PostPosted: Sat Jun 04, 2016 8:21 pm 
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Joined: Tue May 22, 2012 10:28 pm
Posts: 277
Images: 2
Location: Burlington, Ontario, Canada
We started the build by opening a twofour of beer and inviting some friends over to dig a big hole. Two tree trunks later, a few dips in the pool and we have rough foundation hole.
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The kit arrived yesterday and we got it all into the garage. There was a single broken piece but I contacted the company and they will be sending me a replacement part within 10 days.
Image
We have decided to paint the greenhouse "strawberry wine" colour. Hopefully we get that started tomorrow.
Image

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 Post subject: Re: Buying a Greenhouse
PostPosted: Fri Jun 24, 2016 6:02 pm 
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Joined: Tue May 22, 2012 10:28 pm
Posts: 277
Images: 2
Location: Burlington, Ontario, Canada
This past weekend we started the build and man was it a hot one. Every day was above 30C in the shade.

Day 1

A little bit more digging to get the beams in

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Hole is finally ready for the screening

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One layer of beams

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Finished the beams
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Day 2

Corners going up, my Dad playing hid and go seek behind a panel.

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Four walls are up

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Day 3 we got the first rafters up and some of the polycarbonate panels. The day was shorter than usual because of a mandatory Unionized break for the England Euro Match.


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Day 4

Some tricky alignment of the rafters slowed us down but 90% of the greenhouse is done. We are missing a door, trim and benches.
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I wont using it this winter but next year I plan on insulating the knee walls and adding, additional layer polycarbonate and of course heaters.
I just put in three data logging temperature/humidity gauges and par light meter to see where I am at with my readings.

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 Post subject: Re: Buying a Greenhouse
PostPosted: Fri Jun 24, 2016 7:49 pm 
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Joined: Thu Apr 18, 2013 6:39 am
Posts: 760
Location: Davis, CA
Great looking gh! Thanks for sharing the pics.

I really like the color and it goes really well with the other structures and the pool : )

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 Post subject: Re: Buying a Greenhouse
PostPosted: Fri Jun 24, 2016 9:55 pm 
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Joined: Fri Oct 24, 2003 1:57 pm
Posts: 16501
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Location: Texas, USA
beautiful, congratulations

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