Tree Eucalyptus papuana [Ghost Gum] Gained its common name from its beautiful, smooth, white bark. Drought tolerant, low water use once established. Adapted well to urban conditions. The leaves have a high phenolic acid content and make it difficult to grow other plants beneath the Ghost Gum. The eucalyptus beetle poses greatest threat, with oval-shaped holes being one of the signs of infestation.
Shrub Audio Recording AvailablePurdue Plant Doctor Available Forsythia × intermedia [Border Forsythia] The most showy forsythia cultivars are found in this vigorous and adaptable hybrid species. Cut stems excised in mid-winter will flower indoors due to very short chilling requirement. Hardy to USDA Zone 4 for vegetative parts and USDA 5(6) for flowers. Flower buds are killed by severe winters in zone 5, and frequently in colder zones. Plants, however, are hardy in Zone 4. Too big for most foundations and small border plantings (Don't Shear!). Remove… Audio Recording AvailablePurdue Plant Doctor Available
Shrub Audio Recording AvailablePurdue Plant Doctor Available Forsythia × intermedia 'Courtasol' [sold as Gold Tide®] [Dwarf Border Forsythia] 'Courtasol' is a compact, dwarf cultivar that can function as a groundcover. It has arching branches that are covered with an abundance of bright yellow flowers early in the spring. Cut stems excised in mid-winter will flower indoors due to very short chilling requirement. Hardy to USDA Zone 4 for vegetative parts and USDA 5(6) for flowers. Flower buds are killed by severe winters in zone 5, and frequently in colder zones. Plants, however, are… Audio Recording AvailablePurdue Plant Doctor Available
Shrub Purdue Plant Doctor Available Forsythia × intermedia 'Karl Sax' [Karl Sax Border Forsythia] The Karl Sax Border Forsythia is a dense shrub that bears its dark yellow flowers horizontally. Flower buds are more cold hardy than many Forsythia variants, but flower buds can be killed by severe winters in zone 5, and frequently in colder zones. Plants, however, are hardy in Zone 4. Cut stems excised in mid-winter will flower indoors due to very short chilling requirement. Too big for most foundations and small border plantings (Don't Shear!).… Purdue Plant Doctor Available
Shrub Audio Recording AvailablePurdue Plant Doctor Available Forsythia × intermedia 'Spectabilis' [Showy Border Forsythia] 'Spectabilis' is a well-known and high quality Forsythia variant that has been around for many years. It is a very vigorous grower and prolific bloomer with bright yellow flowers that smother the branches early in the spring. 'Spectabilis' flower buds have better cold hardiness than many cultivars, but flower buds can be killed by severe winters in zone 5, and frequently in colder zones. Plants, however, are hardy in Zone 4. Cut stems excised in… Audio Recording AvailablePurdue Plant Doctor Available
Shrub Purdue Plant Doctor Available Forsythia × 'Meadowlark' [Meadowlark Forsythia] This hybrid of Forsythia ovata and F. europaea is an excenllent variant for the Midwest and is noted for its abundance of cold hardy flower buds that open to create a bright yellow flower show in the spring. Cut stems excised in mid-winter will flower indoors due to very short chilling requirement. Too big for most foundations and small border plantings (Don't Shear!). Remove old wood for best appearance. Purdue Plant Doctor Available
Tree Indiana Native Audio Recording AvailableID That Tree Video AvailablePurdue Plant Doctor Available Fraxinus americana [White Ash] Not as adaptable as Green Ash but has better esthetics. Heavy crops of seeds on female trees cause litter, and these germinate freely making the tree slightly weedy. An unattractive ash flower gall (caused by mites) can develop on male flowers and persist into winter. Subject to storm damage, so plant in areas that shelter the tree from strong winds. Emerald Ash Borer is severely affecting all species of this genus. Damage can be prevented… Indiana NativeAudio Recording AvailableID That Tree Video AvailablePurdue Plant Doctor Available
Tree Audio Recording AvailablePurdue Plant Doctor Available Fraxinus americana 'Autumn Applause' [Autumn Applause White Ash] The Autumn Applause Ash has a dense and rounded form with excellent maroon fall color. Heavy crops of seeds on female trees cause litter, and these germinate freely making the tree slightly weedy. An unattractive ash flower gall (caused by mites) can develop on male flowers and persist into winter. Subject to storm damage, so plant in areas that shelter the tree from strong winds. Emerald Ash Borer is severely affecting all species of this… Audio Recording AvailablePurdue Plant Doctor Available
Tree Audio Recording AvailablePurdue Plant Doctor Available Fraxinus americana 'Empire' [Empire White Ash] 'Empire' is a narrow, upright tree with handsome fall foliage. Fruits can be a litter problem. An unattractive ash flower gall (caused by mites) can develop on male flowers and persist into winter. Subject to storm damage, so plant in areas that shelter the tree from strong winds. Emerald Ash Borer is severely affecting all species of this genus. Damage can be prevented with the appropriate pesticide, but the treatment cost will eventually exceed replacement… Audio Recording AvailablePurdue Plant Doctor Available
Tree Audio Recording AvailablePurdue Plant Doctor Available Fraxinus americana 'Junginger' [sold as Autumn Purple®] [Autumn Purple White Ash] The Autumn Purple White Ash is a popular variant due to its attractive glossy foliage and purple-red fall color. It is a male clone and does not produce any fruit litter. An unattractive ash flower gall (caused by mites) can develop on male flowers and persist into winter. Subject to storm damage, so plant in areas that shelter the tree from strong winds. Emerald Ash Borer is severely affecting all species of this genus. Damage… Audio Recording AvailablePurdue Plant Doctor Available
Indiana Native
![Forsythia × intermedia 'Courtasol' [sold as Gold Tide®]](https://www.arboretum.purdue.edu/explorer/wp-content/uploads/sites/2/2023/01/NAME-235-150x150.jpg)
![Fraxinus americana 'Junginger' [sold as Autumn Purple®]](https://www.arboretum.purdue.edu/explorer/wp-content/uploads/sites/2/2023/01/NAME-245-150x150.jpg)