Garden Series: Greenhouse Gardening in the Winter, P8

Source: Donna Balzer

Photo Source: Unsplash,

I ask my client to  google her latitude and use her Three Year Gardeners Gratitude journal to track when days are shorter than ten hours (approximately Oct- end of Feb) because unless she adds a lot more supplemental lights  to boost the natural light during winter, she won’t get maximum plant growth in her home greenhouse. 

Using supplemental lights and starting seeds indoors before planting seedlings out in your greenhouse also speeds up growth in the winter greenhouse. Cool crops such as arugula, kale, Bok Choi and spinach will germinate and grow in a mild indoor grow-light area and when moved out to the climate controlled greenhouse with extra lights, they can fill the gaps when lettuce and bok choi are harvested. Provided the greenhouse is heated to a minimum of 5 degrees C and florescent T5’s or LED grow-lights are hung no more than 30 cm above cool season crops, seedlings will keep growing in the greenhouse after transplanting. 

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