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With my leeks not maturing as fast as I wanted them to I decided to give them some protection so they overwinter. I also needed a bit more covered space for potted perennials that I neglected to plant. I wanted something inexpensive, fast to make and strong enough to withstand a foot of snow at a time. This tunnel is a hybrid version of quick hoops and my own ideas. I put the whole thing together last Sunday afternoon in about an hour. Should I leave out the part when I had to go back to the home center because the bolts I bought were to short, maybe I will keep that part to myself....
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Above is all the materials you will need to make the frame, Total cost for these materials was about $17 cdn not including plastic. Materials include:
- (4) 1/2"x10' pvc electrical conduit
- (3) 1"x2"x8' lumber
- (4) 2 1/2" bolts and nuts
- (4) washers
The only other thing you will need is enough plastic or row cover the fit the tunnel. I used plastic I had on hand, I would prefer row cover but I didn't want to wait for an order to arrive.
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To build the tunnel start by placing one end of the conduit in the ground 12-18" deep and then bend the other end down placing it 12-18" deep as well. My bed is narrow so I ended up with a tall tunnel but it will also fit a bed 36"-48" wide. Continue placing the conduit, evenly spaced up to 8' long. With all the conduit in, cut one 1x2 to the length of the tunnel and fasten it in place.
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Fasten the 1x2 in place by drilling a hole through the conduit into the 1x2. Then place your bolt through the hole and tighten everything in place with the washer & nut.
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The top 1x2 will lock all the conduit into each other and will stop snow/rain from pooling on top. Now the only weakness is the tunnel will sway from wind and snow pressure. I solved this problem by cutting the other two 1x2's into stakes that were 12" higher then the tunnel.
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These two stakes were then driven into the ground on either end to correspond with the top 1x2 brace. Once firmly in the ground I pre-drilled into the top 1x2 and added two screws to fasten everything together. Now you will have a frame that will survive high winds and heavy accumulations of snow.
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With the frame all done I placed the plastic on the frame leaving about 6" extra on each side. I weighted down the plastic with heavy rocks and also buried the back edge with soil to further weight it down. The front edge I want to have easy access to so currently I have just tucked the plastic down. Before the weather turns bad I will be picking up either
Greenhouse clips or binder clips to hold the front plastic in place.
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Now for what will be in the tunnel:
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Chard. The empty spot behind will be for overwintering potted perennials. Come
spring the perennials will come out and I can use the space to harden off seedlings.
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A lone tatsoi, get growing tatsoi!
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And the main reason for the tunnel, my late planted leeks. As long as
they overwinter they should be ready for harvest some time next spring.
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After I was done the tunnel I put the barrel greenhouse back in place that I made last winter. I will be transplanting some greens into the barrel soon and place plastic on it after that. I think I may plant some tatsoi in the barrel as well. If we have a warm December they may just grow.