I know it is gray and cold and very February, but I’ve been
growing some beautiful lettuce and I can’t thank the man who made it happen
because I don’t know his name. So this is a shout out to the anonymous cute
young guy at Brogue Hydroponics who had the brilliant idea. Plus, a thank you
to the guy I usually take for granted who made it possible.
Earlier this year I announced my plans to figure out
hydroponic gardening. It seemed like the last frontier and a way to grow
gorgeous lettuce in the winter. Alas, there is nothing growing hydroponically
in my home. It just kept getting shoved to the bottom of the to-do list for too
long and now it will be next winter’s best intention.
But hydroponics do figure in to my winter lettuce growing
operation. Last summer and fall as I was gathering information about hydroponic
gardening, I began to badger the people who work at the
Brogue Hydroponics stand at the market. One young guy was particularly helpful and I explained to
him my desire to get in on the hydroponic gig and asked if it would be possible
to tour their farm. He looked around and quietly said, “No, they don’t really
like anybody visiting the farm.” Hmmm. I don't know many secretive farmers. This
peaked my interest.
I continued to interrogate the nice young man every week. He
told me that sometimes they join the summer farm tour. That was way too long to
wait. Finally, exasperated by my questions, he said, “You can just re-grow the
stuff you buy, you know that right?” He explained that if I tore off the
lettuce head from my newly purchased lettuce. I could replant the bottom of the
head, the part that is still in soil when purchased. I
asked if I needed to plant it in water or if I could just put it in dirt and he
shrugged his shoulders. “Would probably work in either.” I went home happy with
my new information.
The previous weekend, my husband had finally built me a cold
frame (don’t be that impressed, I’ve been asking him to do this for nearly ten
years.). He strategically placed it on our southeast facing slope just below
the blueberries. I think this is strategic, not just from a sunshine angle, but
also to discourage me from adding another row of blueberries (as I did last
year).
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Baby lettuce about three weeks old. Yes, I realize
someone needs to weed this. |
The days were growing colder my this time, so I opened up my
cold frame where baby lettuce leaves were just beginning to sprout and planted
the bottom of a head of hydroponic lettuce. Then I promptly forgot about it.
It’s easy to forget about cold frames when they are closed because they rarely
need watering encased as they are in their own ecosystem.
|
Don't be distracted by the handsome cat, just look
at that lettuce! |
On a sunny day near Christmas, I popped open the cold frame
to check how the baby lettuce was growing and I was greeted by a huge head of
butter lettuce that looked exactly like the one I’d purchased back in early
November. It was, quite possibly, the most delicious lettuce I’ve ever tasted.
The baby lettuce surrounding it was only about a half-inch bigger than the last
time I’d looked. I’m not expecting it to grow bigger than my thumb until March
or April at this rate.
|
Wowee - wow, wow, wow! |
Of course, since then I’ve planted more hydroponic lettuce. It’s
all I can do to keep from opening the lid on a daily basis to see how it’s
doing. The temperatures are hovering around freezing or below this week, so
I’ve resolved not to open the box for fear the cold air will be too much for
the baby lettuce.
Cold frames are very simple to build. I asked my husband
what was necessary and here’s the response I got. I need to warn you that he’s
an engineer, so there may be more information here than you necessarily need and it may sound more complicated than it actually is. Fear not - you can do this. It's basically a classic sandbox with a lid.
Supplies
2 ea 8ft 2x12 (pressure
treated) for the base
3 ea 8ft 2x4 (pressure
treated) for the top
1 ea 26inx8ft clear
polycarbonate corrugated roof segment. Also the 24in plastic “closure
strips” to nail down corrugated (sold in same aisle of store)
Hinges
Scraps for internal corner
bracing, etc.
2 ea 8ft 5/4x6in
Cedar deck boards (to line the box at/below soil line)
3 inch deck screws, 2-1/2in
stainless screws, special fasteners for the corrugated roof material (also sold
in that aisle)
Location: On a hillside facing Southeast. The hill is important because
this box has no slope to the roof. In order to put on flat ground it
would need a roof that has a pitch to allow rain to slide off.
Base: The finished dimensions are 4 ft
x 4 ft. The base is made from the two 2x12’s, each cut to 4ft and then screwed
together with deck screws at the ends. I squared it up then secured with
scraps (diagonals) to keep it square as it was moved around into place.
An approximately 4 inch deep trench was dug to get below the grass root level;
lay in the base and double check square (diagonal measurements equal).
Use the cedar (cut to length) to line the box down to the bottom of the
hole, and fasten in place with stainless screws (not required but I had some
left over from a previous job). This keeps most of the pressure treated
wood out of contact with the soil while taking advantage of the long life of PT
and Cedar in contact with the ground. Using regular pine or fir would
only last about 2 years in contact with the ground. I was tempted to put
in the dirt and fill the sides, but one never knows what will need to be
changed, so fill in after all other steps are complete.
Roof (lid):
Made a 4ftx4ft square with the 2x4’s
and then put in some corner bracing as well as additional studs to allow
nailing of the corrugated (trying to use as little as possible to keep it
light). Put on hinges and installed on the base to make sure everything is ok,
square and matching up nice. Then nailed on the closure strips and 4ft
long pieces of the polycarbonate. Note that the poly roof is a little
larger than the box, but only 1/2in or so on a side. It creates a little
bit of an overhang as a drip-lip. You don’t want too much or it will get
caught on your pants or the lawn mower over time. Now that the box is all
finished, fill it in.
I screened the soil before putting it
back in the box so it is nice top soil with no rocks, weeds, grubs, etc. I used
all the rocks to fill in the outside edge as this may also be considered good
drainage and we have so many rocks we need places to put them. The sod goes in
the woods since I don’t want to encourage any grass growing around the outside
edges. Over time, the grass will grow to the outside edge then need to be
weed-wacked. Now would be a great time to mulch around the outside of the
box.
I also put a long 2x2 board on a screw
to allow the top to stay propped open (like on a grand piano). As you
lift the top, the long board extends and sits on the ground so the top stays
open on warm days or to weed/plant/harvest. Also I put a few scraps of
wood nearby to prop open the top just enough to let air in, but keep the
chickens out. (Otherwise the inside of the box would get too hot)
Every time I go to the market, I look for the young guy who
told me about re-planting my hydroponic lettuce, but I haven’t seen him at the
stand since the day he passed along that information. I don’t want to promote
conspiracy theories or anything, but it’s suspicious that he’s been missing
ever since revealing one of their secrets. Who knew hydroponics was such a
furtive agricultural practice?
If you decide to build a cold frame it can increase your
growing season on both ends. Herbs like parsley and rosemary will most likely
keep growing year round in a cold frame. Build it soon and you’ll be able to
plant lettuce this month and harvest in late March! Oh, the possibilities! I’m
hoping to convince my engineer to design me some taller boxes for next fall to
ensure peppers and peas through thanksgiving. If he’s lucky, I’ll forget all
about my hydroponic dreams!