Our grow boxes and in garden green house is beginning to come together. We now have two 18 inch wide by 30 feet long grow boxes built from treated 2 x 8 lumber in our garden. To those grow boxes we are adding the structure to allow us to grow vertically and support our in garden green house. The grow box construction is covered on page 78 of the MGC.
Before mixing and adding our growing medium, sawdust and sand for us, we added our pre-plant mix to the bottom of the grow box. Page 85 in the MGC book tells us to add one ounce per linear foot. So to this 30 foot grow box we measured out and added 30 ounces of pre-plant fertilizer. The grow box is now ready to be filled with a custom growing medium.
We utilized the free sawdust we were able to get locally to make our custom growing medium and sand. Following the MGC book, we mixed three parts sawdust to one part sand. This is mixed by volume and NOT by weight.
One 50 pound bag of all purpose sand filled a 5 gallon bucket so we used that as our measuring tool. After each bucketful of sawdust was added to our wheel barrow we added approximately 1/3 of a bag of sand. After the 15 gallons of saw dust and 5 gallons of sand were in the wheel barrow we mixed everything with a shovel before pouring it into the grow box. Each 10 foot section of our 30 foot grow boxes required 15 gallons of sand and 135 gallons of sand.
Once the grow box is full and level we have to add our pre-plant and weekly fertilizer to the medium and mix it in thoroughly. Page 87 in the MGC book calls for 1 ounce per linear foot of the pre-plant fertilizer mix and 1/2 ounce per linear foot of the weekly feed.
These are a little late in coming, but both boxes are now full and there is more progress on the green house portion. Later today we will order the green house plastic to cover the structure