Northern catalpa or Indian cigar tree (Catalpa speciosa) has enormous presence in any landscape setting (USDA hardiness zones 4-8). Finding a 70 – 80 foot tree with a massive trunk and thick sinuous limbs is not unusual from Ohio south thru Tennessee. In summer its huge heart –shaped, pale green leaves may be easily reach […]
Archive for the ‘winter hardiness’ Category
Best of Perennial Veronicas for Gardens
Chicago Botanic Garden (CBG) has published the results of a 10-year study of speedwells (Veronica and Veronicastrum) in its 33rd issue of Plant Evaluation Notes, “A Comparative Study of Veronica and Veronicastrum“. Seven speedwells received good-excellent ratings for their overall performance, including Veronica ‘Fairytale’, V. ‘Giles Van Hees’, V. austriaca ‘Ionian Skies’, V. longifolia ‘Blue […]
‘Sky Pencil Holly vs ‘Dee Runk’ Boxwood
Boxwoods and hollies are mainline evergreen shrubs, utilized for low hedging, privacy barriers. Single shrubs are planted solely for their architectural accent. Both hollies and boxwoods grow best in moist, well-drained soils and in full sun to partial shade. Both prefer soils with a pH of slightly acidic to slightly alkaline. Boxwoods tend to be more shade tolerant than […]
Hardy Forms of Deodara Cedar
I am surprised by the increasing numbers of deodara cedars (Cedrus deodara) that are prospering in Zones 6-b and 7 gardens. Apparently, deodara cedars are much hardier than once thought. The buzz at a recent American Conifer Regional meeting is these varieties list here are worthy of planting: Tree forms: ‘Karl Fuchs’ ‘Shalimar’ ‘Eisregen’ ‘Eiswinter’ ‘Polar […]
Growing Hardy Camellias
Growing camellias in Tennessee is no longer a dream. Through the efforts of several plant breeders, particularly Dr. William L. Ackerman of the U.S. National Arboretum (retired) and Dr. Clifford Parks of Camellia Forest Nursery, as many as 40 cultivars of winter hardy camellias to -15 °F are now available in nursery commerce. Flower colors […]