PLANTS FOR MINNESOTA 313 



with this exception. All plants of questionable hardiness should be 

 carefully protected. 



LIST OF PLANTS FOR MINNESOTA 



A. Hedges. Owing to the severe exposure to which a hedge may 

 be subjected only small groups can be recommended as entirely "iron- 

 clad." No broad-leaved evergreens can be listed and only the most 

 hardy sorts of conifers, among them being the Black Hills variety of the 

 white spruce, given here as picea canadensis. Early spring-flowering 

 shrubs hke the golden bell and deutzia are not hardy and none of the 

 beeches should be used for windbreaks or other types of hedges. Most 

 of the other plants shown in Chapter XII can be planted safely. 



a. Barriers: 



Crataegus coccinea Picea excelsa 



Scarlet-fruited Thorn Norway Spruce 



Hifpophae rhamnoides Rhamnus cathartica 



Sea Buckthorn Common Buckthorn 



Juniperus virginiana Ribes alpinum 



Red Cedar Alpine Currant 



Lonicera tatarica Ribes oxycanthoides 



Tartarian Honeysuckle Wild Gooseberry 



Picea canadensis Rosa rugosa 



Black Hills Spruce Japanese Rose 



b. Windbreaks: 



Acer tataricum Pinus strobus 

 Tartarian Maple White Pine 



Picea canadensis Pinus sylvestris 

 Black Hills Spruce Scotch Pine 



Pinus nigra austriaca Salix 

 Austrian Pine Willow 



B. Ground Cover. No evergreen ground-cover plants seem to 

 prove hardy in the region covered by this list, and so the plants given 

 are confined to deciduous shrubs and vines. Perennials can be used 

 in proportion to the winter protection provided for them. 



a. Shrubs: 



Artemisia sericea Ribes aureum 



Siberian Wormwood Flowering Currant 



Comptonia asplenifolia Ribes oxycanthoides 



Sweet Fern Wild Gooseberry 



