Is 40 degrees too cold for plants?

Online Answer
Times for planting might include late winter or early spring, when temperatures fall below 40 degrees at night in most parts of the country. ... After hardening off the annual seedlings, you can plant hardy annuals if the temperature stays at 40 degrees or above.
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3. Roast Low &.
30 minutes per pound at 350 degrees F until Internal Temperatures reaches 175 degrees F..