If you started plants in a greenhouse, they’ve already been growing in direct sunlight, so the process is abridged: Open the windows for a few hours each day for about a week, then move seedlings to a sheltered outdoor spot for two hours the first day and four hours the second day. Be aware that high temperatures and intense, direct sunlight may “cook” your plants, especially in Southern gardens, so gauge conditions and use your judgment before attempting this. ![]() Remove the container for each day’s hardening-off session, setting it back into place and securing it into the soil afterward. Location (s): Indoor Download Resource Using grow lights or sunny windowsills, your class can experiment with growing a wide range of plants, from houseplants and blooming bulbs to edible crops like radishes and lettuce. We start seeds indoors before the last frost date and plant them out before, at, or after the last frost date. That’s the date that all counting is made from. To find your last frost date, go to these links if you live in Canada or in the USA. Burying the bottom in a few inches of soil will hold the container in place, and you can water plants through the pouring hole at the top. For the spring indoor seed starting schedule, we need to know our last frost date. ![]() If absolutely necessary, and as long as the weather isn’t hot, you can even plant your seedlings directly in the ground and harden them by covering each individually with a plastic, gallon-size milk container with its bottom and cap removed.
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