Monday, November 7, 2011

American Arborvitae, Shrub, woody plant of The Day


Thuja occidentalis 'Tiny Tim'
    Eastern Arborvitae,  American Arborvitae,  Siberian Arborvitae,  Northern White Cedar,  White Cedar

Type    Shrub, woody plant
Hardy range    3A to 7A
Height    36" to 4' / 90cm to 1.20m
Spread    4' to 5' / 1.20m to 1.60m
Growth rate    Slow
Form    Rounded
Exposure    Partial shade or partial sun to full sun
Persistence    Evergreen

Bloom Color    Yellow
Bloom Time    Spring

Environment
This plant tolerates some drought, flooding and a little salt.
This plant will grow in dry to wet or submerged soil.
Suitable soil is well-drained/loamy, sandy or clay.
The pH preference is an acidic to alkaline (less than 6.8 to more than 7.7) soil.

Leaf Color    Green
Fall Color    Copper
This plant has attractive fall colors.

Culture Notes
Transplanting is moderately easy if plants are root-pruned and either balled and burlapped or potted.  White-Cedar likes high humidity and tolerates wet soils and some drought, but not salt exposure of any kind.  The foliage turns brownish in winter, especially on cultivars with colored foliage and on exposed sites open to the wind.  Many of the natural stands in the United States have been cut.  Some remain in isolated areas along rivers throughout the East.

Planting and establishing shrubs

The most common cause of young plant failure is planting too deep.  Plant the root ball no deeper than it was in the nursery.  In most instances, the root flare zone (point where the top-most root in the root ball originates from the trunk) should be located just above the landscape soil surface. Sometimes plants come from the nursery with soil over the root flare. If there is soil over this area, scrape it off.  The planting hole should be at least twice the width of the root ball, preferably wider.  In all but exceptional circumstances where the soil is very poor, there is no need to incorporate anything into the backfill soil except the loosened soil that came out of the planting hole.  Never place ANY soil over the root ball. If a row or grouping of plants is to be installed, excavating or loosening the soil in the entire bed and incorporating organic matter enhances root growth and establishment rate.

Weed suppression during establishment is essential.  Apply a 3-inch thick layer of mulch around the plant to help control weed growth.  Keep it at least 10 inches from the trunk.  If you apply it over the root ball, apply only a one or two inch layer.   This allows rainwater and air to easily enter the root ball and keeps the trunk dry.  Placing mulch against the trunk or applying too thick a layer above the root ball can kill the plant by oxygen starvation, death of bark, stem and root diseases, prevention of hardening off for winter, vole and other rodent damage to the trunk, keeping soil too wet, or repelling water.  Regular irrigation through the first growing season after planting encourages rapid root growth, which is essential for quick plant establishment.


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