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Plant varieties and zone information

From "Garden Sense"
episode DGAR-109

(Continued from page 1)

Tsuga canadensis – Canadian Hemlock

Pyramidal needled evergreen grown as a hedge or screen or as a specimen in larger landscapes
Produces brown cones less than one inch
Plant in rich, moist, but-well drained soil; does not tolerate drought
Plant in full sun to partial shade; does not tolerate heat or urban stress
Prune as needed in the spring
Watch for tiny "cotton ball" growths at base of needles – sign of Hemlock Woolly Adelgid
Height: 40-70 feet; Width: 30-50 feet
Hardy in USDA zones 3-7:
- Zone 3: Plant in spring to prevent winter heaving; plant in full sun to light shade; apply extra mulch after first hard frost; avoid contact with salt; avoid exposure to winter wind.
- Zone 4: Plant in spring to prevent winter heaving; plant in full sun to light shade; apply extra mulch after first hard frost; avoid contact with salt; avoid exposure to winter wind.
- Zone 5: Plant in spring to prevent winter heaving; plant in full sun to partial shade; apply extra mulch after first hard frost; avoid contact with salt; avoid exposure to winter wind.
- Zone 6: Plant in fall; plant in light to partial shade; avoid exposure to winter wind.
- Zone 7: Plant in fall; plant in light to partial shade; avoid exposure to winter wind; may struggle in warmer areas of this zone.

Spiraea nipponica – Snowmound Spirea

Dwarf deciduous shrub with dark blue-green leaves and white flowers in mid to late spring
Maintains a neat rounded form
Plant in rich, moist, but-well drained soil
Plant in full sun to light shade
Prune as needed while dormant in winter; fertilize in spring
Height: 3-5 feet; Width: 3-5 feet
Hardy in USDA zones 4-8(9):
- Zone 4: Plant in spring to prevent winter heaving; plant in full sun; apply extra mulch after first hard frost; avoid contact with salt.
- Zone 5: Plant in spring to prevent winter heaving; plant in full sun; apply extra mulch after first hard frost; avoid contact with salt.
- Zone 6: Plant in fall or early spring; plant in full sun to light shade.
- Zone 7: Plant in fall; plant in full sun to light shade.
- Zone 8: Plant in fall; plant in full sun to light shade.
- Zone 9: Plant in fall; plant in full sun to light shade; may struggle in warmer areas of this zone.

Calycanthus floridus – Sweetshrub or Carolina Allspice

Large deciduous, suckering shrub with fragrant (spicy) dark maroon flowers in spring.
Leaves are fragrant when crushed, but fragrance is highly variable between different plants. There is a wide range of fragrance intensity in this plant. Walter's experience has shown that if the leaves and twigs are highly fragrant when crushed, the flowers will also be more strongly scented.
Plant in rich, moist, but-well drained soil
Plant in full sun to partial shade; may become open or leggy in shadier locations
Prune after flowering in late spring
Height: 6-10 feet; Width: 6-12 feet, suckering
Hardy in USDA zones (4)5-9:
- Zone 4: Plant in spring to prevent winter heaving; plant in full sun; apply extra mulch after first hard frost; avoid contact with salt; may suffer some branch dieback in this zone.
- Zone 5: Plant in spring to prevent winter heaving; plant in full sun; apply extra mulch after first hard frost; avoid contact with salt.
- Zone 6: Plant in fall or early spring; plant in full sun to partial shade.
- Zone 7: Plant in fall; plant in full sun to partial shade.
- Zone 8: Plant in fall; plant in full sun to partial shade.
- Zone 9: Plant in fall; plant in full sun to partial shade.

Iris sibirica 'Steve Varner' – Siberian Iris

Deciduous perennial producing clumps of grassy foliage and 3-inch beardless lavender flowers in summer
Plant in reliably moist to wet soil; will tolerate standing water and boggy conditions
Plant in full sun to light shade
Remove dead foliage in fall
Height: 2-3 feet; Width: 2-3 feet, spreading
Hardy in USDA zones (3)4-9:
- Zone 3: Plant in spring to prevent winter heaving; plant in full sun; apply extra mulch after first hard frost; avoid contact with salt; may be marginally hardy in this zone.
- Zone 4: Plant in spring to prevent winter heaving; plant in full sun; apply extra mulch after first hard frost; avoid contact with salt.
- Zone 5: Plant in spring to prevent winter heaving; plant in full sun; apply extra mulch after first hard frost; avoid contact with salt.
- Zone 6: Plant in spring; plant in full sun to light shade; apply extra mulch after first hard frost.
- Zone 7: Plant in spring; plant in full sun to light shade; apply extra mulch after first hard frost.
- Zone 8: Plant in spring or early fall; plant in full sun to light shade.
- Zone 9: Plant in spring or early fall; plant in full sun to light shade.

Gardening by Zip Code
If you're looking to start a gardening projectbut don't know your gardening zone—visit the National Gardening Associations's USDA Hardiness Zone Finder. Enter your Zip Code to identify the proper zone.

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