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6 Ways to Protect Your Flowers From Frosts and Freezes

by | Updated: Apr 12, 2021

How to protect tender flowers from freezing - tips for rookie western gardeners

You know you’ve entered the “joys of western gardening club” when …

It feels like summer one day… and the next day you’re bracing yourself for frosts, freezes and snow.

(I’m not crying. I have something in my eye.)

If you’d like your annuals — your one-season flowers — to stay alive, it’s helpful to find ways to protect them from Mother Nature’s cold snaps.

So, in this article, you’ll find 6 ways to help protect your tender flowers from frosts and freezes.

You’ll also find a tip to help protect your trees and shrubs, which can be vulnerable to sudden cold spells too.

Do you have to do anything when a frost or freeze is in the forecast?

In the spring, it’s a good idea protect your newly-purchased flowers, especially your summer annuals. (These are your tender flowers that grow for one season only and don’t like frost.) That way you don’t have to buy replacement flowers!

If you’re reading this article in the fall, nope, you don’t have to do anything. You can sit back and see what Mother Nature throws at you, especially if you’re ready for your flower season to be over. But if you’d like your flowers to last a little longer, it helps to protect your plants.

Here we go!

Protecting your sensitive plants is about finding ways to keep them warm

When you see your neighbors frantically covering their tender flowers, what they’re trying to do is keep their plants warm.

If you can keep your plants just 5 degrees warmer than the cold conditions around them, it often can make a big difference for your plants.

So, what generates heat around your flowers?

  • Your dirt (“soil” in garden lingo) can generate heat. It can warm up during the day and help offer heat at night.
  • You also can add place things in your garden that can create heat, which I’ll chat about later in this article.

As you look for ways to protect your flowers, ask yourself:

“Is what I’m doing going to help generate or retain heat around my plants?”

If it’s not, skip it and look for another option.

Here are 6 ways to keep your flowers warm

1) Thoroughly water the soil around your flowers in the ground
(This is important for your trees and shrubs too)

If watering feels counter-intuitive when we’re talking about freezing temperatures, I’m with you.

But watering your soil before a freeze can actually help warm your plants.

And remember, heat is the goal here.

Moist soil can keep the surface air around your flowers up to 5 degrees warmer than surrounding temperatures.

Why?

Because moist soil retains heat better than dry soil.

It helps to water during the day, so the soil warms up and any water that splashes on your plants has time to dry before temperatures drop.

Tip: Wet leaves, flowers and stems freeze more quickly than dry ones.

When you’re done watering, be sure to unscrew your hose, so you avoid any issues with pipes freezing and breaking.

Because we’re trying to remove headaches, not create them, am I right?

Tip: Watering is important for your trees and shrubs before freezes too, particularly in the fall. Scroll to the end of this article for more on watering your trees.

2) Move your pots of flowers to a warmer, protected area

I know some flowerpots are too heavy to move, but move what you can.

An attached garage or a mud room can work well as a temporary holding space when temperatures dip.

If you can’t bring your containers inside, even moving them to a dry, covered area on a porch or deck may help.

I would try to put your containers right next to your home out of the wind, and look for a spot where the walls may radiate some heat. Depending on how cold it’s going to get, you also may want to add on tip #3 below.

Keep in mind, cold air sinks and warm air rises, so avoid moving your pots to the low spots in your yard.

3) Build a “tent” around your flowers

This one sounds a little complicated, but let’s keep it simple.

Here’s all you’re trying to do.

You’re covering your flowers with a cloth fabric to keep the heat in, but you’re staking the fabric up (the best you can) so it doesn’t touch your plants.

Frost flower protection: A cotton sheet tent over tender flower plants in preparation for a frost and freezing temperatures
The photo above may look like at an attempt at a spooky Halloween display, but it’s actually an impromptu tent for my tender flowers.

I used 3 shepherd’s hooks as my frame. (They’re the hooks I normally use to hang pots of flowers.) I hung cotton sheets over them. Then, I used safety pins, clips and wood boards to “close” the tent and keep the heat in.

To create a tent, you can use:

  • For your frame: Metal rods, tomato cages, lawn furniture, shepherd’s hooks for hanging flower pots, etc. Get creative!
  • For your cover: Woven cloth fabrics like old bed sheets, pillow cases, towels, a lightweight picnic blanket… basically, the items you want to donate from your linen closet. You also can use “garden fabrics,” like a commercial-grade landscape fabric or heavier types of “floating row covers” (which are fabrics used in vegetable gardening). I would look for garden fabrics at local, independent garden centers and online.
  • For your clips: You can use safety pins, binder clips from your office, plastic clips, etc.

If you want to keep it really simple, I’ve given you a pre-made tent option at the end of this section.

So, why does using cloth fabric matter?

It all comes back to heat.

Woven cloth fabrics offer better insulation than plastic materials, and they don’t conduct the cold like plastic does.

Ideally, you want to extend the tent all the way to the ground.

I’d extend your tent all the way to the ground (even over a flowerpot), so you can capture the heat from the ground.

Pin or clip the fabric together to keep cold air out and warm air in. If you have gaps in your tent (even down at the ground), you’re losing heat.

If possible, try not to let the fabric touch a plant:

  • For one thing, this helps keep the warm air circulating around your entire plant.
  • Just as important, if wet fabric touches your plant, you may accidentally cause the damage you’re trying to prevent. (This shouldn’t be an issue if you’re using that garden fabric known as floating row cover. It’s an exception.)

If this sounds like too much work, there are pre-made frost protection tents for your plants.

You can see an example in the photo below.

Pre-made tents made of commercial-grade landscape fabric to protect plants during frosts and freezes

Search online for phrases like:

  • “Plant protection tents” or
  • “Pop-up plant protectors”

These tents quickly pop up. They’re easy to use. And because they flatten up when you’re done, they’re easy to store.

4) Avoid using plastic sheets to cover your plants, unless you have no other option

Why?

Because plastic doesn’t have the insulating properties of woven fabric.

Plus, if plastic is touching your plants, it can conduct the cold and contribute to the damage you’re trying to prevent.

But if you don’t have other options, make it work, baby! It can be better than nothing.

Just prop it up, so it doesn’t touch your plants.

5) Place empty containers over tender plants to trap warmth from the ground around your plants

You can use boxes, buckets, recycling bins, garbage cans, empty flowerpots and other containers. Generally, these devices work well if you’re going to get snow because they’re unlikely to collapse under the weight.

You can use garbage cans and buckets as frost covers

Sometimes, it’s hard to get these containers to sit perfectly flat on the ground.

If you have any gaps where cold air can get in and warm air can escape, look for ways to fill the gaps (like sticking old towels into any open spaces).

Just remove these covers during the day when it warms up.

6) Get creative with ways to generate heat around your flowers

You may see your neighbors filling milk jugs with hot water or placing warm bricks near their plants.

Both options can create warmth in the shelters you’re placing around your plants.

It’s like a little campfire for your plants.

All these methods should work well for brief temperature dips

But if you’re going to get an arctic blast (especially one that lasts a few days), you may need a stronger heat source or you may want to try doubling up on the methods above.

Let’s chat for a sec about your trees and shrubs

At our lower elevations in states like Colorado, we can get temperature swings that are really hard on our trees and shrubs.

When temperatures plummet in the fall, your trees and shrubs don’t get the chance to ease into dormancy.

These plants haven’t had a chance to gradually turn the water in their veins into “antifreeze” yet.

Even when we aren’t facing big temperature swings, our trees are often drought-stressed.

And “stressed” is not the way you want them entering winter!

It can help to give your trees and shrubs a deep, soaking water before a freeze too

If you have a newly-planted tree or shrub, water the root ball area.

Otherwise, soak the ground around the outer circumference zone of your tree (out where the branches of leaves end), rather than soaking the trunk area.

This outer area is known as your tree’s “drip line,” and it’s where your tree’s roots are actively absorbing water.

Going from a beautiful garden to a freezing mess stinks, but it’s part of gardening life in western states like Colorado

If you think it’s tough to be a gardener here, remember it’s even tougher to be a plant. 🙂

But you’ve got this.

If you want to protect your tender flowers and keep them alive, I hope these tips help you feel more confident in what you’re trying to do!

To learn which flowers are more vulnerable than others to cold temperatures, check out how frosts and freezes affect your flowers.

Do you have friends who may want to protect their flowers too?

Sharing is caring. Please share this article with them.

© 2020-2021, Go West Gardener
You’re welcome to share a link to this article on social media sites, but no other re-use in any form without written permission.

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Ann from Go West Gardener with her flowerpots and garden

Hey there, I'm Ann

I’m a Certified Colorado Gardener, dog mama and Midwesterner-turned-Colorado girl. I help budding gardeners in the inter-mountain west get more confident with flower gardening, so you can create an outdoor space you love. More about Ann >>

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