Flower Gardening

Is 40 Degrees Too Cold for Annuals

Valeriebayer1 added on May 17, 2016 | Answered

Is 40 degrees too cold to put annuals outside?

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Certified GKH Gardening Expert
Answered on May 19, 2016

It is for many, but not all, annuals. Petunias are usually pretty hardy down to that temperature. A good rule of thumb for leaving annuals unprotected outside is to wait until the nighttime temperatures consistently stay around 50 degrees, but you'll want to follow the directions on your seed packets or plants or consult your local nursery.

There's also a list of cool-temperature annuals in this article: https://www.gardeningknowhow.com/ornamental/flowers/fgen/plants-fall-garden.htm

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