Pinus sylvestris ‘Green Penguin’ – A dwarf pyramidal to columnar form of Scotch Pine with unusual green needle clusters of longer older needles and shorter new ones. It only grows about 2-3″ a year and is considered a hardy substitute for the traditional Alberta Spruce. ‘Green Penguin’ is also a good container specimen. Grows 3-4′ high by 2′ wide. Hardy to zone 3.
Cephalotaxus harringtonia ‘Korean Gold’ – A golden Japanese Yew Plum with a columnar habit similar to many upright Taxus. It grows about 6-12″ a year and may scorch if planted in the hot afternoon sun in warmer regions. ‘Korean Gold’ has a dense growth habit and requires good soil drainage, particularly in winter. Grows 6-10′ high by 3-6′ wide. Hardy to zone 6.
larix laricina ‘Blue Sparkler’ – A deciduous conifer with eye-catching bluish-silver summer foliage that shifts to a beautiful gold in the fall before dropping. It is very cold hardy which makes it an ideal container specimen, even for interior landscapes. ‘Blue Sparkler’ is best used as an accent shrub and it assumes a pyramidal form naturally. Grows 3′ high by 2.5′ in 10 years. Z2.
Juniperus x pfitzeriana ‘Daub’s Frosted’ (syn. Juniperus x media) – A spreading Juniper with distinct yellowish new growth that matures to a bluish-green. It is a good choice for mass planting or bank retention, particularly where irrigation is limited. As with all Junipers, it thrives in a full sun exposure with adequate drainage. Grows 18-24″ high by 3-6′ wide. Hardy to zone 4.
Wollemia nobilis – An ancient species related to the Monkey Puzzle Tree which was recently discovered (in 1994) in New South Wales, Australia. One of the surviving Wollemi Pines has been estimated to be upwards of 1,000 years old. It features warty dark brown bark, glossy deep green flattened needles and both male and female cones. Grows 40’+ high by 12-15′ wide. Zone 9.