Tree Quercus × 'Crimschmidt' [sold as Crimson Spire™] [Crimson Spire Oak] The Crimson Spire Oak is notable for its powdery mildew resistance and reddish fall color that it gained from its White Oak parent, in addition to the dense, strong, vertical, columnar form, and tolerance to drought and urban conditions gained from its Fastigiate English Oak parent.
Tree Quercus × warei 'Long' [sold as Regal Prince®] [Regal Prince Oak] The Regal Prince Oak is notable for its resistance to powdery mildew and borers, strong vertical, columnar form, and tolerance to wind and ice. Holds its dense, fastigiate form into old age.
Shrub Rhododendron × 'Aglo' (P.J.M. Hybrid Group) [Aglo Rhododendron] 'Aglo' is a compact grower and early bloomer. One of the most cold tolerant flower buds of the evergreen rhododendrons. Avoid harsh, dry, windswept sites. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices.
Shrub Rhododendron × 'Elite' (P.J.M. Hybrid Group) [Elite Rhododendron] 'Elite' is a large, vigorous rhododendron and one of the earliest P.J.M. cultivars to bloom. One of the most cold tolerant flower buds of the evergreen rhododendrons. Flowers can become a dirty looking lavender soon after opening. Avoid harsh, dry, windswept sites. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices.
Shrub Rhododendron × 'Hino-red' (Kurume Hybrid Group) [Hino-red Azalea] 'Hino-red' is a hardy, compact, evergreen azalea that produces bright red flowers in early spring. Avoid harsh, dry, windswept sites. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices.
Shrub Rhododendron × 'Northern Starburst' (P.J.M. Hybrid Group) [Northern Starburst Rhododendron] 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.
Shrub Rhododendron × 'Olga Mezitt' (P.J.M. Hybrid Group) [Olga Mezitt Rhododendron] 'Olga Mezitt' is a vigorous rhododendron with pink flowers. One of the most cold tolerant flower buds of the evergreen rhododendrons. Flowers can become dirty looking soon after opening. Avoid harsh, dry, windswept sites. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices.
Shrub Rhododendron × 'Purple Gem' [Purple Gem Rhododendron] 'Purple Gem' is a compact, rounded, dwarf rhododendron that is hardy to 15 degrees Fahrenheit. Avoid harsh, dry, windswept sites. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices.
Shrub Rhododendron × 'Victor' (P.J.M. Hybrid Group) [Victor Rhododendron] The compact and slow-growing cultivar 'Victor' is the earliest of the 'P.J.M' Hybrid group to bloom. One of the most cold tolerant flower buds of the evergreen rhododendrons. Flowers can become a dirty looking lavender soon after opening. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices.
Shrub Rhododendron × 'P.J.M.' (P.J.M. Hybrid Group) [P.J.M. Rhododendron] One of the most cold tolerant flower buds of the evergreen rhododendrons. Flowers can become a dirty looking lavender soon after opening. Quite variable in form and flower color. Avoid harsh, dry, windswept sites. Susceptible to a large number of pests and diseases, which can largely be prevented by good cultural practices.
![Quercus × 'Crimschmidt' [sold as Crimson Spire™]](https://www.arboretum.purdue.edu/explorer/wp-content/uploads/sites/2/2023/01/NAME-540-150x150.jpg)
![Quercus × warei 'Long' [sold as Regal Prince®]](https://www.arboretum.purdue.edu/explorer/wp-content/uploads/sites/2/2023/01/NAME-542-150x150.jpg)
