Robinia hispida var. fertilis
Can fix nitrogen. Especially well adapted to poor, dry, alkaline soils. Though native, can be invasive on sandy soils. Frequent pruning may be needed. […]
Author: Kirby Kalbaugh
Posts by Kirby Kalbaugh
Robinia pseudoacacia
Widely variable in form, the most picturesque are straight-trunked with branches abruptly fanning out at the top. Fixes N2. Locust borers are troublesome and difficult to control, but many trees live with them successfully for many years. Leaf minors and permanently wet soils can be problems. […]
Rosa rugosa
Widely adapted to soils and exposures, but especially good in full sun on dry soils. Relatively trouble-free among roses, even resists the common rose pathogens and phytopagous insects. The hips (rose fruits) are a rich source of vitamin C and used commercially in teas. Can get borers in canes (rarely). Good cultural practices are important […]
Rhododendron × ‘Purple Gem’
‘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. […]
Rhododendron × ‘Victor’ (P.J.M. Hybrid Group)
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 […]
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Rhodotypos scandens
Relatively trouble-free. Tolerant of a variety of soils and environments, particularly dryness and shade. Commonly becomes straggly if growing in a site that is too dry or too wet. […]
Rhus aromatica
A highly variable species in both ultimate height and fall foliage color. Color probably also varies with soil type, possibly as a function of moisture content. Plants are native to dry, sandy, and rocky soils, and usually color well under these conditions. Useful for bank stabilization since it develops roots on stems touching the soil. […]
Rhus aromatica ‘Gro-low’
‘Gro-low’, as the name implies, is a very low-growing (and popular) female cultivar. Rhus aromatica is native to dry, sandy, and rocky soils, and usually colors well under these conditions. Useful for bank stabilization since it develops roots on stems touching the soil. It also suckers. Can spread too quickly for some sites (spreading rhizomes). […]
Rhododendron × ‘P.J.M.’ (P.J.M. Hybrid Group)
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. […]
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Rhododendron × ‘Aglo’ (P.J.M. Hybrid Group)
‘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. […]