Studies of Salt Tolerance of Landscape Plant Species and California Native Grasses for Recycled Water Irrigation

Significance to the Landscape and Nursery Industries In the face of California’s rapid population growth, the competition for increasingly limited water resources has necessitated the use of recycled water for landscape and nursery irrigation. A reference list of the sensitivity of plant species to recycled water would facilitate implementation of recycled water irrigation. The information generated by this study is valuable for both landscape and nursery irrigation management. Species used in this study: Abelia grandiflora ‘Edward Goucher’ (Abelia), Acacia redolens (Redolen Acacia), Albizia julibrissin (Silk Tree), Arbutus unedo (Strawberry Tree), Buddleia davidii (Butterfly Bush), Buxus microphylla japonica (Janpanese Boxwood), Ceanothus thrysiflorus (Ceanothus), Cedrus deodara (Deodar Cedar), Celtis sinensis (Chinese Hackberry), Clytostoma callistegioides (Trumpet Vine), Cornus mas (Cornelian Cherry), Cotoneaster microphyllus ‘Rockspray’ (Cotoneaster), Escallonia rubra (Escallonia), Euryops pectinatus (Golden Marguerite), Forsythia intermedia (Forsythia), Fraxinus angustifolia (Raywood Ash), Ginkgo biloba (Ginkgo), Jasminum polyanthum (Jasmine), Juniperus virginiana ‘Skyrocket’ (Juniper), Koelreuteria paniculata (Goldenrain Tree), Lantana camara (Lantana), Liquidambar styraciflua (Liquidambar), Mahonia pinnata (California Holly Grape), Myrtus communis (True Myrtle), Nandina domestica (Heavenly Bamboo), Nerium oleander (Oleander), Olea europea ‘Montra’ (Dwarf Olive), Pinus cembroides (Mexican Piñon Pine), Pistacia chinensis (Chinese Pistache), Pittosporum tobria (Tobira Pittosporum), Plumbago auriculata (Cape Plumbago), Prunus caroliniana (Carolina Laurel Cherry), Quercus agrifolia (Coast Live Oak), Rhaphiolepis indica (Indian Hawthorn ), Rosa sp. (Rose), Sambucus nigra (Elderberry), Sapium sebiferum (Chinese Tallow Tree), Washingtonia filifera (California Fan Palm), Bromus carinatus (California Brome), Deschampsia caespitosa (California Hairgrass), Deschampsia elongata (Slender Hairgrass), Elymus glaucus (Anderson valley ecotype), Elymus glaucus (Blue Wildrye, coast range ecotype), Elymus glaucus (Stainslaus, 2000 ft. elevation), Elymus glaucus (Stainslaus, 5000 ft. elevation), Festuca californica (California Fescue), Melica californica (California Melic), Poa scabrella (Pine Bluegrass), Muhlenbergia rigens (Deergrass), Sporobolus airoides (Alkali Sacaton), and Stipa pulchra (Purple Needlegrass).