Cold Tolerant Indoor Plants

madreselvaDecember 30, 2009

Which indoor plants tolerate cold weather, 40 degrees or so?

This is my first winter in my new home and I've kept all of my plants in a second floor sunroom. However, it's not heated and as the days have gotten colder, so has the temperature in my "plant room."

I've already removed two large, old oxalis which haven't gone into dormancy in years but looked as though they might overnight from the cold, and now I'm wondering which others need rescuing. Here is a list of the other plants in the room:

Ficus Benjamina

Olea (Olive Plant)

Dracaena Godseffiana

Ming Aralia

Geranium

Polka dotted philo

Ceropegia woodii

chlorophytum

saxifraga sarmentosa

spathiphyllum

aglonema

money tree

lucky bamboo

Any help is appreciated.

Happy holidays!

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subtropix

40 F. is the average temp? Minimum? Maximum?--Way too cold for most of the plants you list--which are mostly tropical. Still, the Saxifraga, Chlorophytum,Geranium and Olive should survive the ice age. Really though depends on what you mean by 40 F..

    Bookmark   December 30, 2009 at 10:33PM
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mr_subjunctive

I wouldn't actually trust any of the above to 40F, though in a pinch the Saxifraga and Spathiphyllum might come through it okay, especially if you're very sparing with the water. (Even if the Saxifraga defoliates, it's probably still alive and will come back.) I don't know about the Olea one way or the other, having no personal experience with them.

I'd move everything else. In fact, if you can somehow go back in time and move the Aglaonema and Philodendron, like, three weeks ago, that would be good.*

For tropical plants in general, you usually don't want to go below about 60F/16C; there are exceptions, of course, but tropical means, you know, tropical.

-

*Some Aglaonemas have been selected by breeders for cold tolerance, and can handle very cold temperatures for brief periods without injury, but the genus in general is very sensitive to cold. Without knowing the particular variety you have, a certain amount of urgency seems called for.

    Bookmark   December 30, 2009 at 10:37PM
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grrr4200(z3 MI)

what about an electric heater? i agree with the above those temps are very cold for tropical plants but some may come through it just fine. I mean it does snow in southern texas sometimes and some people have ficus trees growing in their yards and they do just fine. Are these extended temperatures of 40 or under? Id either get a heater or clear out the room:) goodluck!

    Bookmark   December 30, 2009 at 10:45PM
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madreselva

To be fair, some of the plants, like the aglonema and aralia, have new growth and two of the geraniums have flower buds. Hmmm...from stress?

I will move them.

I should have mentioned that the room is not a constant 40 degrees, but that the temperature fluctuates between 65 and 40, and unfortunately, it is the best lit room in the house.

Are there cold tolerant plants? I know the saxifraga dies back in the summer when it gets to 90 degrees or so, and then slowly grows back in the fall.

    Bookmark   December 31, 2009 at 1:44PM
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greenman28 NorCal 7b/8a

Olive should be fine.
I have an olive outside that gets snow.

Josh

    Bookmark   December 31, 2009 at 2:15PM
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subtropix

Sure there are cool tolerant plants but these are not usually the ones to be found in your average NYC indoor plant store--which tend to feature tropicals that can survive the heat of the average overheated NYC apartment in the winter. Here are a few that will thrive with winters that have a 60's to 40's range. Your posting mentions nothing about light conditions but assuming there's some decent sun I'd suggest (based on personal experience) the following--if you can buy them locally (there's always eBay):

Citrus (oranges, lemons, kumquats)
Podocarpus (mine have been growing outside for years now)
Olives
Cycas revoluta (Japanese sago palm)
Phoenix canariensis (Canary Island Date palm)
Pittosporum tobira
ivy (English or H. canariensis 'Algerian')
Temperate bamboos
Yucca (including the tropical houseplant one)
Beaucarnia (pony tail palm)
loquats (Eriobotra japonica)
cacti
Chamaerops humilis (Mediterranean fan palms)
Rhapis palms
Most succulents including jade plants, agaves, and aloes (just keep them DRY)
Araucaria (Norfolk Island pine)
Trachycarpus fortunei (windmill palms)
Fatsia japonica
Dicksonia antarctica (Tasmanian tree fern)
Livistona chinensis (Chinese fan palms)
Clivia
Camellias
gardenias
geraniums
bay laurel
Schefflera (umbrella tree)--At least the dwarf variety has survived winters regularly in my cold garage.

Good luck!:)

    Bookmark   December 31, 2009 at 2:18PM
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mr_subjunctive

There's not a lot that would be happy down to 40F, though at one point in my life I was living on an unheated porch, in winter, in Iowa, which occasionally got down into the high 30s, and as a result I know that Yucca guatemalensis/elephantipes can go to 40F (though just barely). Also Pedilanthus tithymaloides and (if kept very dry) Sansevieria trifasciata. I've also seen a jade (Crassula ovata) survive being covered in snow, over a long period, though I don't recommend it.

Cryptanthus spp. (earth stars),
Tradescantia pallida (purple heart),
Tradescantia zebrina (wandering Jew),
Sempervivum spp. (hen and chicks),
Asparagus spp. (asparagus ferns),
Hedera helix and H. canariensis (English and Algerian ivies),
Synadenium grantii,
Plectranthus nummularius (Swedish ivy),
Tolmiea menziesii (piggyback plant),
Spathiphyllum spp. (peace lilies -- which are much tougher, temperature-wise, than they look),
Clivia miniata,
and Schlumbergera cvv. (Christmas/Easter/Thanksgiving cactus)
will all tolerate cold to some degree or another, though some of those will die back, partly or totally, if the cold is extreme or sudden, and I don't know that I'd trust them all to 40F, especially if I didn't have to. Some orchids and Hoyas can also get cold for brief periods without damage, though I don't know that any of these should be kept cold for a whole winter, and it's only some of them, not all of them.

    Bookmark   December 31, 2009 at 2:40PM
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meyermike_1micha(5)

There are so many smart people here, that maybe many can help you seperate true tropical plants from those that are not. I think you might even have some sud-tropical ones.

I know that certain citrus, jasmine and olive that I have can handle temps that low, but much prefer the 50's. In fact, olive and some jasmine are required to have these temps to set bloom.
Plumeria if you keep them on the very dry side, rest.
Clivias can set bud. ..
I would probably do a search on each plant and find out what tolerates and requires certain temps...

If it were me and my room was getting below the 50's, I would put an electric heater on a timer, a thermomter, and a humidifyer with constant air movement by fan and keep the temps warmer.

Maybe some here can help identify the ones that actually need cooler temps to thrive. I am horrible with names..
Sorry.

Too, you could empty all those plants out of the room before you loose them if you do not use heat and are not sure.

Tropicals are just that, and love warmth, thrive in warmth. If you don't provide these temps, then most just might hang on or die from root temps being too cold. Also watch out for watering. It only takes once when the soil stays damp too long before rot sets in on most these plants. Try to water sparingly until the temps rise.

Goodluck..

If it were me, I would invest in a small heater and keep it warmer..That is what I do..

Mike..;-)

1 Like    Bookmark   December 31, 2009 at 2:56PM
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meyermike_1micha(5)

Wow Mr-subjunctive and Dave,

A big thanks from me too...! Alot more than I ever imagined..very imformative!

Mike..:-)

    Bookmark   December 31, 2009 at 3:28PM
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domehome(9 CA)

Hi there,
I'm in zone 9B, that means we don't freeze every year. I grow all types of geraniums outside, they should be fine at 40. The olive is definately ok. The Ficus won't like it but should be alright, I had one outside for 10 years without losing it. The rest I'd move into the warm part of the house.
Dee

    Bookmark   December 31, 2009 at 10:16PM
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mr_subjunctive

Geranium =/= Pelargonium. Many Geraniums are fairly cold-tolerant; Pelargoniums not so much.

    Bookmark   January 1, 2010 at 1:10PM
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birdsnblooms

Mark, please explain what you mean...
Geranium =/= Pelargonium.

If IL temps didn't drop below 40F degrees, my tropicals would be outside year round..
'Except African Violets, Plumeria and succulents...succulents are included only if there was continuous rain.' Toni

    Bookmark   February 3, 2010 at 1:38PM
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mr_subjunctive

The genus Geranium and the genus Pelargonium are not the same thing. The two words are not interchangeable.

    Bookmark   February 4, 2010 at 10:52AM
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