Greenhouse
I finally got the greenhouse ready just in time for fall planting. I decided to have an unheated greenhouse so I need to plant cool-weather Crop such as: French Sorrel, Swiss Chard, Lettuce, Broccoli, Chives, Top Set Onions, Radishes, Carrots, Rosemary, Fennel, Peas, Dill, Cilantro, Beets, Pansies, and Snapdragons. These can all tolerate colder temperatures, even down to 26 degrees F. I need to plant now before the weather begins to chill.
Mid-August is the best time to start new seeds for transplanting into an unheated greenhouse for a late fall and winter harvest. I could possibly have chard, kale, cabbage, bok choy, pak choy, turnip, dill, cilantro,and snow peas ready to harvest for Thanksgiving and Christmas and throughout the winter. I have planted Broccoli, Cabbage, and Cauliflower so far. I will be planting Swiss Chard, kale, beets, and cabbage next week when I get some more soil.
In September I’ll also start lettuce, spinach,chives, radishes, carrots, and other fast-growing greens for my winter greenhouse. By covering the crops with spun fleece, they will often last until mid to late March.
The greenhouse is super hot now so I hang “shade cloth” on the inside of the greenhouse on the sunny side. The shade cloth should be hung ten weeks prior to your average first frost date, to cast shade on one section of your potting benches for starting cold-weather crop seeds. I had some grass mats left over from another project so I am using them to shade the shelves. They may not look great but they do the job.
Some people have raised beds inside their greenhouses but I prefer to use pots and keep my flooring plant free. That way I don’t need to worry about weeds taking over in case I have to be away for a while.
Here are some simple directions for using pots in the greenhouse.
. Water lightly, and plant small to mid-sized leaf crop seeds (spinach, lettuce, endive, mache) in 4-inch pots filled with potting soil. Plant according to seed packet directions for depth and spacing. Place the pots and trays and set them on the potting benches in the greenhouse where they will be shaded by the shade cloth. I am a bit fugal and save those individual serving food containers (ex. personal size mashed potato cups, macaroni and cheese cups) and use them for this step along with any other container that meets the requirements – just be sure to punch some holes in the bottom. I also direct plant into larger containers when there is room in the greenhouse to do so.
Use tubs, grow bags, half barrels, or milk crates lined with landscape fabric and filled with soil for larger cold-hardy crops (Brussels spouts, broccoli) and root crops (turnips, beets). Follow the seed packet directions for dept but plant the seed at the recommended final spacing. Place the container in it final place and fill with a mixture of equal amounts of compost and potting medium by volume. Water the mixture lightly.
Water the planted seeds lightly as require to keep the potting soil moist but not saturated. Remove the shade cloth when the seedlings reach 4 inches in height. Keep an eye on the greenhouse temperature and open its doors and vents if early autumn days generate temperatures over 90 degrees Fahrenheit.
If you have room in your greenhouse you can plant a second round of all seeds four weeks prior to your average first frost date. And even a third round two weeks after your average first frost date.
You could spread a 6-inch layer of wood chips over the floor of the greenhouse about two weeks before your average first frost date. Water the wood chips until they are moist but not saturated.
If you have an unheated greenhouse , paint milk jugs black using black spray paint and fill the jugs with water. Stack concrete blocks and lumber planks to create shelves on the northerly or westerly side of the inside of the greenhouse. Place the black-painted, water-filled milk jugs on these shelves. This will help keep the greenhouse warmer in the winter. I am using the north side of the greenhouse to hold supplies under a potting table and have started adding gallon water jugs inside of milk crates on the back side of the table. I have to run a hose to the greenhouse so these water jugs also hold the water that I use for the plants between fill ups. They are also small enough that I can easily fill them at the house and simply walk them out to the greenhouse. The potting table will also hold growing plants as needed.
You will need to transplant the seedlings from the 4 inch pots into I gallon nursery jugs filled with mixture of potting medium and compost. Transplant seedlings when they have developed two sets of true leaves. Place nursery pots in trays on potting benches. Again I will use regular milk and water gallon jugs with the tops cut off and holes punched in the bottom for this task. So far I have found enough pots from my mother’s old house that I have not had to cut down any jugs.
Water the fall greenhouse plants on warm days. You need to be careful and only water the soil without getting any water on the leaves. Once a week, add a dilute solution of fish emulsion fertilizer to the watering.
Fall harvest of leaf crops is a bit different. You harvest them when they reach the early stage of maturity, with head sizes about half the size you would grow them to in the spring or summer garden. You should harvest fall-grown root crops at the ‘baby’ stage, about 2 inches to 3 inches in diameter for beets and turnips and about 3 to 4 inches long for carrots.
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