![]() ![]() This is generally a hot time for greenhouses, depending on what type of cooling systems you have. If you have started transplants in the greenhouse, you can now start to plant cold-tolerant transplants outside (broccoli, cauliflower, cabbage) once the night time temperatures are consistently above 45 degrees and warm-season transplants outside (tomatoes, peppers, eggplant) once the night time temperatures are consistently above 55 degrees. You’ll likely be harvesting a lot from crops like lettuce, kale, spinach, and peas. The lengthening days and warmer nights allow for much faster growth in your greenhouse. Begin to seed warm-season crops with shorter days to maturity (beans, basil, cucumbers, squash).īegin to harvest from your first round of cold-tolerant crops and continue planting cold-tolerant, quickly growing crops to replace them. Near the spring equinox, daylight lengthens and plants begin to grow more quickly in the greenhouse. At Ceres headquarters in Boulder, Colorado, February marks the time when there is now enough daylight (about 10 hours a day) to start to seed new crops without needing to use supplemental lighting. The days are beginning to lengthen as we move towards the equinox. Here is a general greenhouse planting guide (broken down by months) that we use for our location in Boulder, Colorado at about 40 degrees latitude. By planning your greenhouse planting schedule according to day length, managing your plant’s location based on temperature, and choosing the right crops and varieties, you’ll be able to harvest year-round vegetables. The warmest part of your greenhouse will typically be along the north wall where the sun reflects off and hits the plants in that vicinity. That’s where you’ll want to place your cold-hardy vegetables throughout the winter, like spinach and kale. The coldest parts of your greenhouse will typically be close to your greenhouse glazing and right next to your vents. The other consideration for your greenhouse planting schedule is the temperature inside your greenhouse, and the many micro-climates that may exist inside the greenhouse. ![]() If you plant your winter garden early enough, plants will be nearing maturity by the end of November and you’ll be able to slowly harvest all winter long from the semi-dormant plants, even without supplemental lights. Plants will continue to survive throughout the winter, but will typically enter a semi-hibernation. ![]() And mid-November marks the time when our days drop below 10 hours and plant growth significantly slows. Where we’re located in Colorado, early February marks the time when our day length begins to reach 10 hours per day, which is generally enough daylight for seedlings to grow. If you are not using supplemental lighting, then it will be critical for you to know what average day lengths are for your area throughout the year. Let’s start with understanding the importance of day-length, which is arguably the most important factor when determining your greenhouse planting schedule. Ĭheck out our printable greenhouse planting guide here How do you keep your backyard greenhouse supplying food year-round? There are two fundamental factors to consider when planning your greenhouse planting schedule: temperature and day-length. ![]()
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