How hardy are the Yuccas?

Many Yuccas are frost hardy to some sense, and the text on this page is how I rate the hardiness in the area where I live.


The hardiness-list is based on cultivation in Northern Denmark. In other climates the hardiness might be different. If you want to know how the climate is in Northern Denmark, you can look at my "climate page".


Hardiness:
This is for mature plants in good health and culture (it's very important that the soil is quite dry, before the plants are exposed to hard frost!!)

14 - No frost at all, fatal, keep above 5C.
15 - Occasional light frost, at night down to -2C, during the day above 5C.
16 - Frequent moderate frost, at night down to -7C, during the day above 5C.
17 - Very frost hardy, at night down to -12C, during the day above 0C.
18 - Often snow-covered, safe down to -20C, can withstand temperatures below freezing for a long period of time!
19 - Hardy in the garden here in Denmark
19-20 Hardy in the garden here in Denmark, if the plant is protected against winter moisture with a sheet of glass! will do very   well in a frame that are covered during the winter.
20 - Hardy in the garden here in Denmark, if the bed is protected against winter moisture!
20-21 Not hardy in the here in Denmark, but if grown in a pots that are outside from late April to mid September and stored dry inside an unheated greenhouse in the winter, or planted inside an unheated greenhouse.
21 - Hardy in an unheated greenhouse. here in Denmark.
22 - Not very hardy, but can be grown in large pots, that are outside in the summer, and are stored dry and frost free during the winter.
 
    hardiness Notes, etc.
Yucca 'Karlsruhensis' 18, 19-20  
Yucca aloifolia 14, 22  
Yucca aloifolia forma marginata 14, 22  
Yucca aloifolia ' Tricolor ' 14, 22  
Yucca angustissima 17, 21 I haven't tried this one out side, and it might be even more hardy!
Yucca angustissima ssp. avia 17, 21 I haven't tried this one out side, and it might be even more hardy!
Yucca angustissima ssp. kanabensis 18, 19-20  
Yucca angustissima ssp. toftiae 17, 21 I haven't tried this one out side, and it might be even more hardy!
Yucca arkansana 18, 19-20 I have only tried forms from Oklahoma, and more northern forms may be more hardy!
Yucca arkansana ssp. freemanii 17, 20-21 I haven't tried this one yet, so this is an estimated rate
Yucca arkansana ssp. louisianensis 17, 20-21  
Yucca arizonica 15, 22 I haven't tried this one yet, so this is an estimated rate
Yucca baccata 18, 20, 20-21  
Yucca baccata ssp. thornberi 17, 21 I haven't tried this one out side, and it might be even more hardy!
Yucca baccata ssp. vespertina 17, 21  
Yucca baileyi 18, 19 I have only tried the northern forms, and forms from a location further south may not  be as hardy!
Yucca baileyi ssp. intermedia 18, 20, 20-21  
Yucca brevifolia 15, 22 My plant is still young, so this is an estimated rate, and it might be even more hardy!
Yucca brevifolia ssp. herbertii ?  
Yucca brevifolia ssp. jaegeriana 17, 21 My plant is still young, but so far it has been OK down to -15C to  -18C
Yucca campestris 17, 21 My plant is still young, so this is an estimated rate, and it might be even more hardy!
Yucca carnerosana ?  
Yucca constricta 18, 20  
Yucca elata 17, 21 I haven't tried this one outside, and it might be even more hardy!
Yucca elata ssp. utahensis 17, 21  
Yucca elata ssp. verdiensis 17, 21 My plant is still young, but so far it has been OK down to -15C to  -18C, I haven't tried this one outside, and it might be even more hardy!
Yucca faxoniana 16, 21-22 My plant is still young, so this is an estimated rate, but it might be even more hardy!
Yucca elephantipes 14, 22
Yucca faxoniana x glauca 17, 21-22 My plant is still young, but so far it has been OK down to -15C to  -18C, I haven't tried this one outside, and it might be even more hardy!
Yucca filamentosa 18, 19  
Yucca filamentosa ssp. concava
forma albovariegata
17, 20 My plant is still young, but so far it has been OK down to -15C to  -18C, I haven't tried this one outside, and it might be even more hardy! White stripes on the leafs
Yucca filifera ? probably not frost hardy since it's a Mexican species
Yucca flaccida 18, 19 This one is the most hardy species, and the most common in cultivation.
Yucca flaccida 'Bright Edge' 17, 20 My plant is still young, but so far it has been OK down to -15C to  -18C, I haven't tried this one outside, and it might be even more hardy! yellow stripes on the leafs
Yucca flaccida ssp. smalliana 17, 19-20 My plant is still young, so this is an estimated rate, but it might be even more hardy!
Yucca flaccida 'Golden Sword' 17, 20 My plant is still young, but so far it has been OK down to -15C to  -18C, I haven't tried this one outside, and it might be even more hardy! yellow stripe in the center of the leafs
Yucca glauca ssp. albertana 18, 19 My plants is still young, so this is an estimated rate, but it might be even more hardy!
Yucca glauca ssp. glauca 18, 19 The hardiest Yucca!
Yucca glauca ssp. stricta 18, 19  
Yucca gloriosa 17, 20-21 I haven't tried this one inside the greenhouse, but it might prove to be very good in there! Outside it does not survive a Danish ice-winter!
Yucca harrimaniae 18, 20-21  
Yucca harrimaniae ssp. neomexicana 18, 20-21 My plant is still young, so this is an estimated rate, but it might be even more hardy!
Yucca harrimaniae ssp. sterilis ? Never tried! If you grow this one and you can spare a cutting, please send one to me!?
Yucca nana 18, 20-21 My plant is still young, so this is an estimated rate, but it might be even more hardy!
Yucca pallida 18, 21 Can survive in a protected bed, but only barely!
Yucca recurvifolia 18, 21 My plant is still young, so this is an estimated rate, but it might be even more hardy!
Yucca recurvifolia x glauca? 18, 19  
Yucca reverchoni x thompsoniana ?  
Yucca reverchoni 18, 20-21  
Yucca rigida 16, 22 My plant is still young, so this is an estimated rate, but it might may probably be hardy in an unheated greenhouse, if planted in a well drained bed.  It handle -7C in Birmingham, England.
Yucca rostrata 17, 21 My plant is still young, so this is an estimated rate, but it might be even more hardy!
Yucca rupicola 18, 21 I have tried this one in a protected bed, and it where killed in a hard winter (1995-95)
Yucca schidigera ? I don't know how hardy this plant will be in Denmark, but it may probably be hardy in an unheated greenhouse, if planted in a well drained bed.
Yucca schottii 16, 22 My plant is still young, so this is an estimated rate, and it might be even more hardy!
Yucca thompsoniana ?  
Yucca torreyi ?  
Yucca torreyi forma parviflora ?  
Yucca treculeana ?  
Yucca whipplei 15, 22
Yucca whipplei ssp. caespitosa 15, 22
Yucca whipplei ssp. intermedia 15, 22
Yucca whipplei ssp. newberryi 15, 22
Yucca whipplei ssp. percursa 15, 22
       



Hardiness of Cactus and other Succulents
 


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