Applies to Chicago area native plants; C-values are from Swink & Wilheim's Plant of the Chicago Region (used for natural areas). They represent whether a plant is likely to occur in a remnant natural plant community. A value of 0 indicates little confidence that it came from a remnant natural plant community. A value of 10 indicates high probability that it did come from one.
An innovative plant introduction program between Chicago Botanic Garden; The Morton Arboretum; and the Ornamental Grower’s Association of Northern Illinois (OGA), to develop and promote the use of new plant cultivars that are well-adapted to the growing conditions of the Upper Midwest.
In botanical classification, a group or related plants with many different species. Plants within a genus share some basic characteristics, but are separated into species by varying smaller characteristics. Genera is the plural form.
The US Department of Agriculture has divided the country into regions based on the average low winter temperatures. Plants are then assigned to a hardiness zone based on the lowest temperature the plant can tolerate before cellular damage occurs.
An invasive plant is usually a non-native species, which competes with native species for water, nutrients and space, destroying the natural habitat and ecosystem of native species. (Different from aggressive; see definition for aggressive.)
A layer of material, such as woodchips or compost, that is applied on the soil surface to retain soil moisture and moderate soil temperature extremes; if organic, will break down to improve soil structure and fertility.
In botanical classification, the level below genus; a group of naturally occurring plants that share the same physical characteristics and are capable of producing offspring with those same characterisitics