Category Archives: MGM Greenhouse

Greenhouse build progress

Greenhouse build progress

We have been working outside this week and thought we would provide an update on the greenhouse build progress.  This greenhouse is being built over our 95 ton heat sink and is part of our geothermal heat sink greenhouse project.  We are still a long ways off from having the the heat sink operational.  You can see what we have accomplished in this picture.

Greenhouse build progress
Greenhouse build progress – hip board installation

 

Arch supports installed

Near the peak of the arches you can see a horizontal support.  They are on all the arches except the two on the end,  These supports will provide rigidity for the arches under heavy winds and snow loads.  We don’t get lots of snow here in NW Missouri but we do generally see some every year.  If we received lots of snow it would have been necessary to go with a different style of arch to support a heavy snow load.  They’re held in place with a self tapping screw to keep them from moving.

Installing greenhouse hip boards

Both sides of our greenhouse will get a hip board and baseboard installed.  You can see the partially installed hip board on one side of our greenhouse in the picture above.

In this picture you can see how we are securing the hip board to our arches.  Notice the Tapcon screw installed through the top bracket.  One bracket at each arch will get a Tapcon to prevent the hip board from moving.  Each arch, with the exception of the two end arches, will have the hip board secured in this fashion.  The two end arches will have a 3/8 inch hole drilled through the board and arch.  A carriage bolt will be used to secure the hip board at each end.

We used a 3/8 impact adapter with a socket and our impact driver to insert the lag bolts.

Greenhouse build progress - installing hip board
Hip board installation on our Zimmerman high tunnel

What comes next

After both sets hip boards are up we will install the base boards.  Once those are on we will need to do a little back filling with dirt to help keep critters from getting inside.

After the base board work is complete the ends will need to be closed up and the door and door frames built.  We will be framing in both ends with treated lumber that was reclaimed from our in the garden greenhouse.  We are still sorting out the details of the end walls.

After the end walls are complete the grow boxes will be built and installed.  They will be filled with sawdust and sand, mixed at 75 percent sawdust.  We likely transplant seedlings into the grow boxes before pulling plastic.

The double layer of greenhouse plastic will be installed this fall once the temperature drops to around 60 degrees.

Geothermal Greenhouse in NW Missouri

A look inside a geothermal greenhouse

We know the owners of this geothermal greenhouse located in NW  Missouri and I get to go over and poke my head inside from time.  It seemed like a terrific idea and I was excited to even go watch it going up.

Yesterday we went by while we in the area to peek inside the geothermal greenhouse.  I was amazed with the progress of the plants inside.   These tomatoes, 5 different varieties if I remember correctly, were planted back in the first week of April.  They’re easily 3 times the size of my own tomatoes that are growing outdoors.

Tomatoes growing in a geothermal greenhouse in NW Missouri
Tomatoes growing in a geothermal greenhouse in NW Missouri
tomatoes grown vertically in a geothermal greenhouse
Tomatoes grown vertically using the Mittleider method in a geothermal greenhouse

About this greenhouse

This greenhouse is a Mittleider design as seen in the Mittleider Gardening Course book.

changes to the in garden greenhouse

Changes to the in garden greenhouse

Recently we made changes to the in garden greenhouse.  Arguable some of these changes are improvements.  They were all minor additions that didn’t add much cost to the project.  Ideally these changes would have been made and implemented during the build.  If you are considering building this I’d highly suggest altering your build plans to include these changes.

changes to the in garden greenhouse
changes to the in garden greenhouse

During our time with the Mittleider in garden greenhouse I’ve changed a few things about it and added my own personalized touches to it.  I’ve outlined these things in this little video we shot today.

We built the in garden greenhouse from the instructions provided in the Mittleider Gardening Course book.  We don’t provide a supplemental heat source to it, but are able to increase our growing season by about 6 to 8 weeks.   It allows us to start planting hardy plants 3-4 weeks before our average last frost of the year.

After the first frost of the year it also allows us to continue growing and protecting our vegetables by simply closing it up and protecting the plants from the cold.  On a sunny day we can easily see temperatures inside the  greenhouse rise 30 degrees above the outside temperatures.

Watch our video to see the changes we made