DIY Winter Greenhouse

With our summer garden almost finished (the only plants left- eggplant, leeks, brussel sprouts, swiss chard and hot peppers), a few weeks ago CP and I planted seeds for our fall/winter garden. With some plants still left in our raised beds, we had to work around them. No biggie (especially for things like carrots and beets) because with staggered planting, we then won’t have to pull the whole crop out at once.

So most of the seeds have come up and are starting to grow. We took down the Buster-proof fences in order to turn over the soil after taking out plants and I wish that we had kept them up because we have a bunny (bunnies?) that is eating some of the seedlings. Oh well.

Anyway, this weekend we started to erect our homemade winter greenhouses over our raised beds. For anyone interested, here are the basic DIY steps to do it on your own.

Supplies needed:
Winter seeds
Metal wire
Garden cloth
Plastic greenhouse film
Heavy duty wide tape
PVC piping
Garden staples
Scissors

Our experimental guide to a winter garden:

1. Buy The Winter Harvest Handbook by Eliot Coleman and read it. Coleman is an organic farmer in Maine whose farm produces four seasons of veggies. If he can do it in Maine, why couldn't we do in CT?
2. Buy winter seeds- there are a few seed companies recommended by Coleman (We used Johnny’s Selected Seeds).
3. Plant winter seeds before first frost.
4. Use metal wire from the Home Depot and shape it into a wicket (or really any shape you want). Push the metal wire into the ground as much as you can, but you want to leave 2-3 feet above the ground for the plants to grow.

Metal wire

Metal wire shaped like wicket

5. Drape wickets with garden cloth. Garden cloth (which we also used this spring to keep out pests/protect against the cold nights) can be found at a bunch of places, we get ours from Gardeners Supply. Rain is able to pass through the fabric while it also allows 85% of light to shine through (according to the website).

6. We then used garden staples to hold down the garden cloth. (See picture above.) Use them all around the structure to keep the cloth from lifting up and off the ground.

7. Next we took PVC piping and made hoops. In the spring we put 1 1/2 “ pipe into the ground at all four corners and depending on the size of the bed either one or two more down the sides. We then took 1” pipe and bent it to make the hoop.

PVC piping

8. Then, using the plastic greenhouse film (see picture, CP found it on Amazon) put up a sheet on the hoops at both ends of the bed. Using the big roll of tape (also found on Amazon), tape the film to the hoop with the tape located on what will be the inside of the greenhouse. Tape up most of the hoop, but leave about two feet at the bottom on both sides so that you can access the plants inside.

Roll of plastic and tape

9. Then take another sheet of the plastic film and drape it from end hoop to the other end hoop (make sure there is a little bit of overhang as you are going to tape the ends down to the plastic film already on the end hoops). Use tape to place about five pieces (per hoop) on the inside of the greenhouse to affix the plastic film to the inside hoops.
10. Make sure that the garden cloth does not touch the plastic anywhere around the structure.
11. Tape or somehow affix the plastic film to the wood all around the raised bed. You don’t want any wind to get in there.

Our first bed looks like this:

Not the prettiest thing, but hopefully it works!

We used a bungee cord to keep the plastic down on the left side. Because the top of the raised bed on the right side is flush with the ground (stupid sloping backyard), we currently have bricks holding down the plastic. We will probably have to do a little more once there is danger of freezing temperatures at night.

Coleman claims that we won’t have to water the entire winter. The plastic will keep the freezing temperatures out and as long as the cloth and plastic film don’t touch, the temperatures in the bed will stay right above freezing. Condensation from the cold outdoor temps and the hotter temps inside the plastic will help water the plants. Crazy huh?

This winter we have planted (the plants need to be ones that are hardier/grow in colder temps. They are going to grow at a slower pace, but according to Coleman, things like carrots are going to be very sweet because they do take a long time to mature):

Bok choy
Pak choi
Golden beets
Carrots
Kale
Spinach
Romaine lettuce
Asian greens
Swiss chard
Broccoli
Cauliflower
Radishes

So now that you have a bit of a primer, will you try winter gardening too?