Garden Series: Greenhouse Gardening in the Winter, P4

Source: Donna Balzer

Photo Source: Unsplash,

My client and her husband are impatient. They seeded a variety of plants in their greenhouse in late August and just a couple of months later they planned to start harvesting vegetables CONTINUOUSLY  every day, all the time. The trouble with this goal is that different plants take a different amount of time to grow and all plants grow more slowly once days are shorter than 10 hours long.

By November 5th the day length in my full sun south facing Calgary garden is shorter than ten hours and in my clients’ Vancouver garden, the day length is shorter than ten hours on November 1. To put this another way,  a greenhouse seeded in late August only has two full growing months before plant growth really slows down; they might survive but they won’t thrive. If the greenhouse temperature is hovering at or above zero, these cold tolerant greenhouse plants do not die, but they largely stop growing.  Unless extra heat and light is added, cool season crops will only grow again in a greenhouse by late February when days are longer.

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