Last year, I tried an experiment: planting potatoes in grow bags. It was an unmitigated disaster, but not for the reasons you'd think. Rather, I blame two things: a poor choice of location, and poor soil.
The location was a narrow strip of land behind our shed, between the shed and the pasture fence.
It seemed logical: fairly protected, close to water, and out of the way. What could possibly go wrong? After a LOT of hard work, I got the potatoes planted in the grow bags (these are twenty-gallon bags, by the way).
At first they grew well, but then several things happened. One, as spring advanced into summer and the weather grew drier and hotter, it quickly became apparent that the topsoil we'd used was more like "top clay." Even though I watered diligently, the poor potatoes were baked into hard clay and had a difficult time growing.
And two, clay is heavy. When I tried to "mound" the potatoes by topping off the grow bags with more dirt, I could barely heave the clay-soil into the bags. Since one side was blocked by the shed wall, I couldn't access the back bags. I ended up just dumping the clay-soil over the potato plants from a distance instead of carefully mounding, which just buried the poor things. Bottom line, they all died. It was very discouraging.
This year, I was determined to mend my mistakes. I'm still enamored with the grow bags and feel they are an excellent alternative to growing potatoes in the ground or in raised beds. This past week, here's what I did.
The first thing I did was removed the bags, emptied them, and relocated them to a better spot. At first I thought it would be a simple matter of using a hand truck to remove each grow bag, but that idea quickly went south. Those bags must have weighed 200 lbs. each (remember, twenty gallons of heavy wet clay!) and I couldn't so much as budge them.
Instead, I laboriously dug the clay-soil from each bag with a shovel, one at a time, and put the clay-soil into the gorilla cart. After fifteen or twenty shovel-fulls, the bag was low enough that I could lift it and dump the remaining soil into the cart.
In this, I had (ahem) lots of help from Mr. Darcy.
One by one, I removed the bags and revealed the pallets on which they'd rested. I removed the pallets and placed them in the front of the house, alongside the Nuclear Strawberry beds, because they would be easy to fence in.
This is a temporary spot, but that's okay. Pallets are easy to move.
Above all, I wanted to make sure I could access the grow bags from all sides for ease of filling. To this end, I made a sort of cloverleaf formation with the pallets.
The next step was to improve the clay-soil. Fortunately we have a mound of compost...
...and a mound of sand we purchased last fall for purposes of amending soil (sadly, far too late to help last year's potatoes).
To a grow bag's worth of clay-soil, I added ten shovels full of compost and five shovels full of sand. Note the dramatic color difference between the clay-soil (at left) and compost (at right).
Then I mixed it all together. I flippin' LOVE using sand to break up clay. It's wonderful stuff. Together with the compost, the result of these efforts was a lovely rich friable soil.
As I emptied the grow bags, I relocated them to their new spot and filled them with about four inches of this soil mixture. To aid in that, I used a cut-off bottomless old garbage can as a funnel, which holds the mouth of the grow bags open while I shovel dirt into them.
This whole process was slow and took place over several days, also factoring in some rainy weather.
Meanwhile, I had a lot of seed potatoes – probably too many.
I have twenty grow bags, so I divvied the potatoes into twenty piles.
Then, for each pile, I cut the larger potatoes into two or three pieces, and left the smaller potatoes intact, for a total of six pieces per pile. I had a lot of seed potatoes, so I could afford not to be parsimonious.
I let them dry for a day or two...
...until the cut side was toughened up a bit. This helps prevent potatoes from rotting in the dirt.
By the way, these are russet potatoes, an indeterminate variety. This means they grow in multiple layers and benefit from being mounded. In lieu of mounding, they will be "buried" up to their necks twice during the growing season.
On planting day, I placed six pieces in each grow bag.
Then, using the garbage-can funnel, I covered the pieces with about four inches of that lovely friable soil mixture.
For the time being, that's all I have to do. We had rain the day after I planted, so they're thoroughly watered.
Sometimes the side of a grow bag wants to collapse inward...
...so I'll prop it up with sticks.
This won't be an issue later in the season as I "mound" more soil in the grow bags.
In the next couple of weeks, we'll bring in more horse panels and widen the fencing to encompass both the strawberry beds and the potato grow bags, to prevent the deer from munching the plants.
I'm confident the potatoes will grow better this year. For one thing, they're in much better soil. For another thing, I can "mound" the soil more carefully around the plants since I can access them from all sides, instead of trying to dump clay-soil from a distance. Time will tell.
It feels good to take a step toward growing things, even if the proper garden isn't built yet.