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Cold weather care for outdoor succulents
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Cold Weather Care for Outdoor Succulents, By Region

Cold Weather Care for Outdoor Succulents, By Region

Should you be worried about your outdoor succulents in winter? It depends on where you live.

It’s all about frost. The temperature at which water freezes—32 degrees F—is the Great Divide. Above that, most succulents are fine. Below that, most are at risk. See “Frost and Succulents: What You Need to Know.

Hardiness Zone Map

The USDA Plant Hardiness Zone Map is a good basic guideline. However, it doesn’t take into account climate variables potentially harmful to succulents.

Regional Care for Succulents, An Overview

There’s very little of North America where every kind of succulent will grow outdoors year-round. The “banana belt” is the heavily populated California coast. Of course, you can grow any succulent anywhere if you’re able to replicate the conditions it likes, either in your home or in a greenhouse. But this article is about cultivating succulents outdoors, in the garden, during the most challenging season: winter.

If you live in…

Coastal CA from the Bay Area south: You don’t get frost (at lower elevations), and humidity and rainfall are minimal, so simply make sure your succulents get good drainage during occasional rainstorms.

Cold weather care for outdoor succulents

My garden is in Southern CA inland, in the foothills NE of San Diego at 1,500 feet (Zone 9b). A freak snowfall happened on New Year’s Day, 2017. When temps rose above freezing, I hosed off the snow. The Agave attenuata at left was damaged but recovered.

Central and Southern CA inland: Frosty nights tend to follow rainy weather, December through February. Like a citrus grower, I pay attention to “frost advisories for inland valleys.” When temps are predicted to drop below 32, I drape succulents with bed sheets or commercial frost cloth made of non-woven fabric[Learn more about how I protect my garden.]

Cold Weather Care for Garden Succulents

When a non-gardening friend noticed bedsheets draped over my plants, she asked if my dryer wasn’t working (!).

Areas of hard frost: You get temps below 32 degrees that last for hours, so it’s not adequate to merely cover your in-ground succulents or shelter potted succulents beneath eaves. Move them indoors or into a greenhouse. Depending on where you live, an inexpensive temporary shelter may be OK. [See “Four Ways to Overwinter Succulents” on this site.]

Northwest and Northeast: Protect and shelter your succulents indoors (perhaps in your basement) or in a climate-controlled greenhouse. [On this site, See “Cold-Hardy Succulents for Northern Climates” for exceptions; “How to Grow Succulents Indoors;” and “Winter Protection for Succulents: Products].

Desert Southwest: You get hard frosts, so protect and shelter tender succulents indoors or in a climate-controlled greenhouse. Those that do well for you include cacti, agaves, dasylirions, yuccas and other succulents specific to your region.

South: If you get frost, see above. But even if temps stay above freezing, you’ll still contend year-round with trying to grow arid-region plants in a wet, humid climate. Find out which succulents you can grow outdoors in Florida and other states too damp and humid for most succulents.

Related info on this site:
How to grow indoors
Overwintering

Frost and succulents Frost damage

Learn more in my books:

Designing with Succulents (2nd ed.):
— Cold-Climate Succulent Gardens, pp. 111-113
— Cultivating Succulents in Challenging Climates, pp. 143-148

Succulents Simplified:
— Protection from Frost, pp. 48-50
— Frost Damage, p. 72 and p. 77

I also recommend this excellent book: Hardy Succulents by Gwen Kelaidis, photos by Saxon Holt.Cold Weather Care for Garden Succulents

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How to Grow Succulents Indoors

If you’re wondering how to grow succulents indoors, basically you need to outfit a basement, sun room, spare room or alcove with tables and shelves that can withstand moisture, plus lights and a fan that run on timers. Fortunately succulents need very little water. Dribble a little at the base of each plant every three weeks or so, enough to hydrate the roots but not so much it puddles on the floor. Don’t fertilize succulents when they’re dormant (growth slows to a standstill, usually in winter).

Move potted succulents indoors when temperatures drop into the 30s. Clean the pots’ exteriors and check for pests. Keep them above 32 degrees F but not higher than 60 (cold is necessary for flowering later on). Keep a fan running to enhance air circulation, and a dehumidifier if the air is moist.

Place your succulents near a window. Maximum sun exposure is on the south and west sides of your house. The farther north you live in North America, east will provide bright light, but not enough for crassulas, echeverias and aloes to maintain their red hues.

Don’t set plants near heaters or furnace vents. They’ll cause the soil to dry out and your plants to desiccate.

Install grow lights. Situate indoor succulents beneath lights that stay on six hours daily. Fluorescent is fine and economical. Experts in growing succulents in gray-sky climates recommend T-5 grow lights. If your plants stretch toward light (or flatten their rosettes to expose more of their surface area), add more lights or move the plants closer to the ones you have.

Agrobrite FLT44 T5 Fluorescent Grow Light System, 4 Feet, 4 Tubes, about $120 on Amazon.

 

No room? Go vertical. Create a “light island.” There are shelving units designed for indoor plants. Each shelf has a waterproof tray, and each unit is lit by two T5 bulbs. The lights, on timers, stay on from 7 am to 7 pm daily. Shown below is arguably the ultimate indoor plant-shelf unit. Made of lightweight, powder-coated aluminum, it has adjustable lights with energy-efficient, full-spectrum bulbs; plastic drip trays; and wheels for easy positioning. Three shelves provide 18 square feet of growing space. From Gardener’s Supply Co.; about $600. 

Get a timer which automatically turns the lights on at, say, 7 a.m. and off eight hours later. I like this one, below, because it has multiple outlets:  Titan Apollo 14, about $26. 

Watch the temperature. If it falls below freezing (32 degrees F) many succulents may show long-term damage (or die). This indoor thermometer is digital and also has a humidity gauge. But what I love about it is that it keeps daily high and low temps for 24 hours!

AcuRite 00613 Humidity Monitor with Indoor Thermometer, Digital Hygrometer and Humidity Gauge Indicator, about $12 on Amazon.

Watch for pests. Succulents in cramped conditions are at risk of mealy bugs, spider mites and other pests. At the first sign of infestation, spray with 70% Isopropyl alcohol. Isolate infested plants so pests don’t spread, and clean the surrounding area.

Related info on this site: Overwintering

 

How to keep succulents happy


 

 

Succulents and Too Much Rain, A French Solution

Want to protect your succulents from too much rain? Here’s how the Jardin Zoologique Tropical in southeastern France keeps their succulents from becoming waterlogged during seasonal rainstorms. Corrugated fiberglass panels atop metal bars tent the plants so excess rain doesn’t soak the soil.

Screen shot 2015-12-14 at 9.39.40 AM

The structures are tall enough to allow good air circulation, and the panels are translucent, enabling maximum sunlight to reach the plants. The covers, which have a horizontal metal rod atop them so wind can’t lift them, also protect tender succulents from frost.

Screen shot 2015-12-14 at 9.39.22 AM

Notice, too, that the plants grow in rocky, elevated, sloping soil, so water drains away from the roots.

Screen shot 2015-12-14 at 9.31.20 AM

You might do something similar in your own garden with a patio umbrella secured in a concrete base. But keep in mind that the water has to go somewhere. The French garden’s panels channel rain onto the gravel roadway nearby.

Btw, this public garden, located near the village of La Londe-les-Maures, is deservedly proud of its succulent collection. Here’s a description from the website, courtesy of Google Translate. The common names of the plants are charming.

Our plant collection is rich in many varieties of succulent plants: agaves, aloes and euphorbias. Every season their blooms transform the gardens. We regularly introduce little-known species and observe them for their ornamental potential. Perhaps the best known are cacti native to the Americas. We grow several species hardy in our climate. Some are globular, like the famous “mother-cushions,” others are elongated, cylindrical and commonly called “candle cactus.” Visitors easily identify the “prickly pear,” also called “Mickey Mouse ears” or “cactus rackets.”

(Photos used with permission.)

Related info

On this site:

How to Water Succulents These fleshy-leaved plants from hot, dry regions are designed to live off water stored in their leaves and tissues in order to survive periods without rainfall. But this doesn’t mean you shouldn’t water them at all…[Continue reading]

Prepare Your Succulents for Rainstorms  Succulents, which come from arid climates, may rot. Stems or trunks turn squishy and collapse. It may be possible to… [Continue reading]

Learn about pumice. No other soil amendment is as widely used by succulent growers and collectors as pumice (crushed lava rock). Here’s why…[Continue reading]

Oh, No, My Succulents Froze!  Will succulents recover from frost damage? It depends. Here’s how frost-tender succulents looked before temps dropped into the mid-20s F, and after…[Continue reading]

Caring for Your Succulent Garden After Rainstorms, Checklist  Rain at last! Could the California drought finally be over? Well, no. It’ll take hundreds of years for underground aquifers…[Continue reading]

Winter Protection for Succulents: Products  Soggy soil, dim light, high humidity and freezing temperatures can be death to succulents native to warm, arid climates. These items will help you get your succulents through cold, wet North American winters…[Continue reading]

On My YouTube channel: 

Why Succulents Rot and How to Prevent It

Why Rain is Good for Potted Succulents

Post-Rain Must-Do’s for Succulent Gardens

 

Books by Debra Lee Baldwin