Finishing the Greenhouse Construction

I have had a couple of email questions about tomatoes and about how my extra-early tomatoes are doing. There was also a comment from Amber asking for an update on our Greenhouse. These are related topics because we will not have ripe tomatoes in May this year due to how slow I was in finishing the Greenhouse. Renee and I built most of it last Fall, but there were several things not completed that prevented the early tomatoes from going in there in time. The tomatoes are doing well and I will post specifically about them later. Its just that I don't think they will be ripe early enough to beat last year's record of June 5th.

The good news is that I finally completed the rest of the Greenhouse construction. The things left to do this Spring were:

1. Install an exhaust fan and run electric to it
2. Build windows to use as vents
3. Build inside grow beds and fill with soil/compost
4. Extend retaining wall and back fill for future greenhouse expansion

That proved to be a little too much to accomplish quickly, but it is now almost complete. The first item on the list was the hardest and the most important. Most people think that a greenhouse needs to be hot, and that is true during cool weather. The biggest struggle with a solar greenhouse is that in the Spring and Summer it can get TOO hot. This time of year is particularly difficult because nights are cold and sunny days get hot. With all of the vents closed up for the night, our greenhouse can easily get to above 120 degrees by mid-morning. The new exhaust fan is thermostat controlled to come on and expel the hot air in that scenario.

Here is a picture of our hoop house from the back where the fan is:

I was able to install the fan myself.

 

Getting the fan put in place was all I could do since I am not an electrician. Later I had an electrician friend come to run the electricity to the fan. In the meantime I set about completing the other items on the list.

I built the windows so I could have flexibility in how much venting to allow each day.

Then I built the raised beds along one side and along the back. This is not a requirement for all greenhouse structures but it was in the book  The 12-Month Gardener by Jeff Ashton, where I got the plans from and I think it will be a great way to grow lettuce and spinach all winter long.

The hardest part was getting the wheelbarrow in to fill up the beds.

I was able to put boards down as plank ramps to go up and in.

 

I also had to tackle the retaining wall. The spot where we placed the greenhouse didn't naturally fit there. There wasn't enough space for it so we had to build a retaining wall and then fill in behind it with fresh dirt. Originally I wanted the greenhouse to be 14 feet by 24 feet. Since we had to move so much earth, we only built half of the wall and then built half of the greenhouse. Next year I want to expand to the full 24 feet so the rest of the wall needed to be put in and back filled.

I moved about 50 wheelbarrow loads of dirt from the spot I dug out to fit the chicken coop in (more on that later). I forgot that we would need to run the electric through that space, so I had to dig part of it out again to make the trench for the electrician to run the pipe with electric wires in it.

My electrical friend came over and did a great job with the pipe and the wiring.

 

He was able to splice in to an existing outside outlet that used to power a swimming pool pump.

 

He put in an outlet and switches to control a light that we will install later and the fan.

 

And finally, here is the fan working!

 

Now we can put plants in our greenhouse without worry of them getting too hot.

 

We may not have been able to use it much this spring, but from now on this greenhouse will grow thousands of plants for us. Our goal is to be able to harvest something from the garden in all 12 months of the year by leaning heavily on this structure in the winter. I'll show you more as we get it all going.

This greenhouse was a little more work than I thought it would be, but it feels good knowing that we built it ourselves from scratch with only a little help from our electrician and a lot of help from The 12-Month Gardener. What a great book that is!

Happy gardening!

- Marc

Comments

[Amber@OneMamma]

Hi! I am so excited for you and your family (and a tad bit jealous, too). Congratulations on getting the greenhouse up and running--it will be fun to watch you develop your year-round garden. Thanks for the update!
Amber

[Jim]

You didn't need to hire an electrician.
You can do that sort of basic wiring yourself...!

[Marc]

Thanks for the encouragement Amber.

Jim, you are right that as electric goes, it was basic. The electrician was a friend and didn't charge me. I was more comfortable letting someone do it who knew what he was doing. All it will cost me is plenty of vegetables and eggs that I will gladly give him throughout the season.

[Tim]

Wow am I jealous! What a fantastic job you did! Its been so wet here that we have only been able to put in four rows of sweet corn.

[jj]

Beautiful! I stumbled upon "The 12-Month Gardener" at my local library this past fall and it quickly became one of my favorites. I would love to have a greenhouse like the one you built but for now I am still trying to finish my Victory Garden cold frame. You had a great entry on how you built it on 2/23 of this year what the book did not explain and I still could not glean from your excellent instructions was how to cut that sharp angle for the side pieces. I know you used a table (a clamping table?) but it was hard to tell from the pictures just how you did it. If you have the time, would you please enlighten me?

And congrats on the chicks. This is also my first time raising chickens, I got 8 in April. I never knew chickens grew so fast.

Thanks for a great site.

[Matron]

How long do you think that plastic sheeting will last before you have to replace it? I find that my blog is a great way to go back a year or two to see and compare what was harvested and when. Some years the tomatoes come much sooner than others.

[Dan]

That greenhouse is so cool. I wonder if I could hook up a fan on my poly tunnel. I have one fruit on my early 'siletz' plant that is about the size of a golf ball now. I hope it ripens by the first week of June.

[Sunita]

I was going through the post(http://gardendesk.typepad.com/.a/6a00e54efed40888340112791514f528a4-pi) where you mentioned making a trellises with PVC pipe. I wanted to make something similar for growing pumpkins. I wanted to know how sturdy was your trellis. Was it able to withstand the weight of the pumpkins? Please let me know.

Thanks
Sunita