|American Landscape Institute|
|American Society of Landscape Architects|
|Horticultural Research Institute|
|International Plant Propagators’ Society|
A select group of plant propagators who promote the seeking and sharing of information about the art and science of plant propagation.
| Landscape Contractors AssociationExists to provide local resources to landscape professionals to help them maximize their business potentials.|
|LandscapeHub is a new website for businesses to buy and sell landscape materials. They are building, with approved buyers and quality suppliers like Manor View, an on-line marketplace.|
| Maryland Nursery, Landscape & Greenhouse Association|
An organization promoting the use of ornamental plants, products and services in Maryland.
|National Association of Landscape Professionals|
|Pennsylvania Landscape Nursery Association|
A non-profit professional trade organization which represents Pennsylvania’s ornamental horticulture industry.
| The United States National Arboretum|
USDA Plant Hardiness Zone Map
| Maryland Cooperative Extension|
Statewide, non-formal education system within the college of Agriculture and Natural Resources and the University of Maryland Eastern Shore.
|The Weather Channel|