Flower color bleaches out in high pH. Subject to winter burning of foliage in exposed sites near the limits of its range, however, this is a good cultivar for cold areas. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices. […]
Read More… from Rhododendron catawbiense ‘Mrs. C.S. Sargent’
‘Roseum’ requires wind and shade protection, although it is a vigorous grower. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices. […]
One of the most cold tolerant flower buds of the evergreen rhododendrons. Flowers can become a dirty looking mauve-lavender soon after opening. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices. […]
Read More… from Rhododendron × ‘Northern Starburst’ (P.J.M. Hybrid Group)
The Shumard Oak is a handsome tree that is drought and air pollution tolerant, and but can also be used in rain gardens. Transplanting and establishment can be difficult. […]
Quercus velutina is a large, deciduous oak with an irregular canopy. It is closely related to Q. rubra (Red Oak), which it is known to hybridize with. The interesting bark of the Q. velutina is nearly black and furrowed. Transplanting is made difficult by the long tap root. Not generally sold commercially. […]
Tolerates most sites. Dioecious. Very invasive, by the seeds that birds love to eat; probably best to refrain from planting this species in the landscape. Susceptible to rusts (Puccinia coronata), that also attacks oats (in oat growing areas, buckthorn eradication is recommended). The bark, leaves, and fruit were once used in purgatives, thus one of […]
The massive genus of Rhododendron has between 800 and 900 species and countless hybrids and cultivars of numerous sizes, flower colors, and hardiness levels. Plants of this genus can be evergreen or deciduous. Azaleas are part of the Rhododendron genus. […]
A widely adaptable, hardey (perhaps more than indicated) small compact shrub. Flowers are relatively small, but numerous, making it very showy in spring. Subject to winter-burning of foliage, but not as much as other rhododendrons. Blooming occurs while the plant is young and occurs heavily. Susceptible to a large number of pests and diseases, which […]
Read More… from Rhododendron minus var minus ‘White Perfection’
Handsome tree with a more upright habit that lacks the pendulous character of the lower branches seen in the species type. Requires an acidic soil and is subject to severe iron chlorosis on calcareous soils. This can be corrected but it means additional maintenance. […]
Somewhat tolerant of city conditions. Oak wilt and scales, and many other oak tree pests, though none considered very serious. Low maintenance, long-lived tree. Use Northern sources in Indiana. […]
The Purdue Arboretum is a collaboration between the Department of Horticulture and Landscape Architecture and Physical Facilities Grounds Department