Cool Hardy Plants

This is a list of potentially or known cold-hardy (min. winter temp of 10 F/-12 C) plant species organized alphabetically by genre.  Entries are cross-checked with The Plant List and the USDA Plants Database to ensure existence & spelling accuracy.  Please leave comments with your own experiences and/or suggestions for new species to add.

To prevent my head from exploding, I am initially focusing on just three great families: Araliaceae (Aralia family), Arecaceae (Palm family), and Asparagaceae (Asparagus family).

Agave bracteosa
Agave chrysantha
Agave deserti
Agave durangensis
Agave ferdinandi-regis
Agave gentryi (Syn. A. macroculmis)
Agave gracilipes
Agave flexispina
Agave havardiana
Agave macroculmis
Agave mckelveyana
Agave montana
Agave murpheyi
Agave neomexicana
Agave ovatifolia
Agave palmeri
Agave parrasana
Agave parryi
Agave parviflora
Agave scabra
Agave schottii
Agave toumeyana
Agave utahensis
Agave victoriae-reginae

Hesperoyucca newberryi
Hesperoyucca whipplei

Mahonia acanthifolia
Mahonia aquifolium
Mahonia bealei
Mahonia calamicaulis
Mahonia duclouxiana
Mahonia eurybracteata (Syn. M. confusa)
Mahonia fortunei
Mahonia fremontii 
Mahonia gracilipes
Mahonia gracilis
Mahonia japonica
Mahonia longibracteata
Mahonia moranensis
Mahonia napaulensis
Mahonia nervosa
Mahonia nevinii
Mahonia nitens
Mahonia oiwakensis (Syn. M. lomariifolia)
Mahonia pallida
Mahonia pinnata
Mahonia repens
Mahonia sheridaniana (Formerly M. fargesii)
Mahonia trifoliolata

Metapanax davidii
Metapanax delavayi

Schefflera alpina
Schefflera bengalensis
Schefflera bodinieri
Schefflera brevipedunculata
Schefflera delavayi
Schefflera digitata
Schefflera fantsipanensis
Schefflera fengii
Schefflera gracilis
Schefflera hoi
Schefflera macrophylla
Schefflera rhododendrifolia (Syn. S. impressa)
Schefflera taiwaniana

Trachycarpus fortunei - Windmill palm

Trachycarpus geminisectus
Trachycarpus latisectus
Trachycarpus martianus
Trachycarpus nanus
Trachycarpus oreophilus
Trachycarpus princeps
Trachycarpus takil
Trachycarpus ukhrulensis

Yucca aloifolia
Yucca angustissima
Yucca arkansana
Yucca baccata
Yucca brevifolia - Joshua tree

Yucca campestris
Yucca carnerosana
Yucca cernua
Yucca coahuilensis
Yucca constricta - White-rim yucca

Yucca decipiens 
Yucca elata - Soap tree
Yucca endlichiana - Patilla Yucca
Yucca faxoniana
Yucca filamentosa
Yucca filifera
Yucca gloriosa
Yucca linearifolia
Yucca pallida
Yucca periculosa
Yucca queretaroensis
Yucca reverchonii
Yucca rigida
Yucca rostrata
Yucca rupicola
Yucca × schottii 
Yucca thompsoniana
Yucca treculeana

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