Are Petunias Cold Hardy? Tips for Outdoor Winter Care
Whether they’re charming, compact millifloras in pastel shades, spreading varieties that cascade over a hill, or grandifloras with three-inch blooms in bold purple, all Petunia species belong to the nightshade family and are native to South America, in regions with hot and humid weather.
While you’ll find more selections of the modern hybrid varieties than ever before, all petunias still share this “warm weather preferred” trait.
They will not tolerate frost – at least not more than a touch of it. And they’re not cold hardy.
We link to vendors to help you find relevant products. If you buy from one of our links, we may earn a commission.
These tender perennials are able to survive outdoors in winter only in warm-weather USDA Hardiness Zones 9 to 11, coming back year after year with proper care.
Gardeners in other areas must satisfy themselves with growing petunias outdoors as annuals.
There’s more to it than that, though.
Even if your flowers can’t endure once freezing weather sets in, you can prepare them to bloom well after chilly temps first arrive, and make preparations all summer to make sure they’ll stay alive as long as possible.
Here, I’ll give a few pointers for those growing perennial petunias in more temperate zones.
I’ll also share my tips for those in cooler areas who want to encourage petunias grown as annuals to flower for as long as possible into the fall.
Here’s what I’ll cover:
Petunia Cold Tolerance
Here’s the big picture on this flower’s cold hardiness:
Petunias thrive when nighttime temperatures are in the 55 to 65°F range, and daytime temps are between 61 and 80°F.
They will succumb to sub-freezing temperatures in a hurry, and anything below 40°F may kill
The website greengrove.cc is an aggregator of news from open sources. The source is indicated at the beginning and at the end of the announcement. You can send a complaint on the news if you find it unreliable.
Brussels sprouts are a healthy vegetable. They are a great source of vitamin K, vitamin C, folate, and dietary fiber. However, their flavor reputation is notoriously bad. Brussels sprouts often find their way onto “most hated vegetable” lists. A veggie rarely eaten and often derided only a decade or two ago has now found its way onto trendy restaurant menus as a signature side or a featured appetizer. It turns out we were cooking them all wrong. Boiled-to-death Brussels sprouts slathered with processed cheese (yuck!) of my youth have given way to roasted, braised, and grilled dishes, some bacon wrapped or with a balsamic glaze (yum!). Brussels sprouts are now one of my family’s favorite dishes! So naturally, I wanted to try my hand at growing them.
Forgetting that she’s not a vegetable gardener, I was recently lamenting to my daughter Lucy that at least a couple of my zucchini plants end up flopping over each growing season.“Oh, are they just being dramatic?” she asked, humorousl
A tart gift from Mexico, tomatillos (Physalis philadelphica) are commonly used by chefs and home cooks throughout the United States and worldwide to add a piquant va-va-voom to sauces and chutneys.Beneath an intriguing yet inedible, papery husk lies a
Some vegetables we grow in our gardens have names that may exaggerate a little. Take ‘Great White Northern’ beans, for example, which I’d argue are just a bit above average, but not necessarily “great.”‘Supersweet 100’ tomatoes go in the opposite direction.We link to ve
Sometimes slow and steady does not win the race. Like all those little kid gardeners, there are occasions when even the adults tire of waiting long periods to see sprouts, or taste the fruits (or should I say greens?) of their labor.That’s where fast-growing vegetables and herbs can really co
The beauty of birds is all around us, but we don’t always slow down enough to enjoy their sounds and sights. Birdwatching is a great way to practice this sort of mindfulness, and with the hobby on the rise, now is a great time to get into it. While bird migration in North America typically happens during the fall and spring, you can still get into birdwatching during summer months.
It’s a testament to the ‘Dwarf Grey’ snow pea’s easy-going nature when I tell you one of the toughest issues is deciding whether to spell that name “Grey,” like the British and even most American distributors, or “Gray” as per common US spelling.Beyond forcing you to deliberate for, oh, 10 seconds or so over
Have you noticed that the foliage-oriented houseplants that will grow enthusiastically without a lot of effort on your part tend not to be particularly colorful? And the flowering ones that do well indoors are typically pretty labor intensive.That’s why I’m such a fan of a houseplant known as the flamingo lily. It’s