Well - it didn't work out so well. . . for two reasons.
The first was my own fault. It was raining light but steady the day I planted those first jugs so I didn't wet the potting mix down very much since I was going to sit them outside as soon as I had them ready. Think sink-hole in a bottle! The potting mix settled so much over the next couple days that the bottles were only 2/3 full and the surface, right where all those very tiny carrot seeds were trying to survive, was all cracked and turned over and just generally a mess!
The second reason it didn't work out so well was that a concern was raised about what chemicals might leach out of the plastic jugs when they were sitting in the sun. Now you can find plenty of proponents coming down on both sides of this issue (Turns out the initial report of this back in 2001came from a University of Idaho student theses and the chemical he claimed was leaching, DEHA, isn't even part of the makeup of water bottle plastics. It was later determined that the study was contaminated by the lab equipment itself, which does have DEHA in it.) but in the interests of playing it safe, I have relegated the water bottles to growing looking-at plants rather than eating plants.
So carrots, round two.
The plan is to plant a couple more small areas in the same box in a couple-three weeks - assuming this experiment doesn't end the way the first try did! If all goes well I have enough room in one grow box for three different batches of each variety, which is probably about all I'll be able to grow to harvest before summer sneaks up and shuts down carrot growth.
The grow boxes come molded with 3/8" holes in the corners for adding covers and trellises. Looking around for something that would bend into a hoop and fit in these holes I grabbed some left over PVC baseboard and ripped 3/8" square sticks from it on the table saw.
By the way, the cut edges of the PVC are SHARP so beware of sliding your finger down the length of a fresh cut or you will have - well - a fresh cut!
I whittled the ends of my sticks down to something resembling round with a handy box cutter so they would fit in the molded holes and they worked great! Though I was careful to keep my body, and especially my face, out of the way in case one of the sticks was to shatter as I bent it into place.
Oh, and the two water jugs have now been properly filled with mix and one has been planted with some Johnny Jump-up's and the other with some California Poppy's.
In case you're wondering, my choices have nothing to do with a master plan or anything as sophisticated as that; they were just based on what seed packets we had laying around.
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