Tuesday, December 1, 2009

Evergreen Ground Cover Of The Day

Chamaecyparis pisifera 'Plumosa Compressa'
Sawara Cypress, Japanese False Cypress


Type Groundcover, woody plant
Hardy range 5A to 8A
Height 2" to 12" / 6cm to 30cm
Spread 36" to 6' / 90cm to 1.80m
Growth rate Slow
Form Prostrate
Exposure Partial shade or partial sun to full sun
Persistence Evergreen

Bloom Time Spring

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

Leaf Color Green, variegated and yellow Fall Color No change in fall color

This plant has attractive foliage.

Culture Notes

Sawara Cypress should be grown in full sun to partial shade on moist, well-drained soil. It tolerates alkaline soil poorly. Regions of the country with moderate to high humidity are best for this plant. Although moderately drought tolerant, it is not especially happy in very hot summers unless provided with some irrigation. This can be partially compensated for by providing a large mulched area preferably out to the edge of the canopy.

The plants transplant reasonably well when root pruned regularly in the nursery prior to moving. It must be given full sun so lower branches remain on the tree to provide the best appearance. Plant looks sloppy if lower branches die or are removed, and this is not recommended. Locate the plant properly away from walks and patios to eliminate the need for pruning.

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.

Monday, November 30, 2009

Evergreen Shrub Of The Day

Thuja occidentalis 'Milleri'
Eastern Arborvitae, American Arborvitae, Siberian Arborvitae, Northern White Cedar, White Cedar


Type Shrub, woody plant
Hardy range 3A to 7B
Height 24" to 4' / 60cm to 1.20m
Spread 5' to 6' / 1.60m to 1.80m
Growth rate Slow
Form Spreading or horizontal
Exposure Partial shade or partial sun to full sun
Persistence Evergreen

Bloom Color Yellow
Bloom Time Spring

Environment

This plant tolerates some drought, occasional wetness and a little salt.

This plant will grow in dry to occasionally wet 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 No change in fall color

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.

Foliage turns brown with the onset of cold winter temperatures. Some of the cultivars, including this one, retain their green foliage well into winter.

Tuesday, November 17, 2009


Polemonium caeruleum 'Brise d'Anjou' syn. Polemonium sibiricum
Jacob's Ladder, Charity, Greek Valerian
Type Perennial
Hardy range 2A to 7A
Height 18" to 24" / 45cm to 60cm
Spread 12" to 18" / 30cm to 45cm
Growth rate Average
Form Upright or erect
Exposure Partial shade or partial sun to full sun
Persistence Evergreen
Bloom Color Blue
Bloom Time Spring and Summer

Environment

This plant will grow in moist soil.

Suitable soil is well-drained/loamy.

The pH preference is a neutral soil.

Leaf Color Green, variegated and yellow

This plant has attractive foliage.

Culture Notes

This variegated plant is an introduction from Blooms of Bressingham. 'Brise d'Anjou' is better known for its striking (but somewhat fragile) variegated, fern-like foliage than its violet-blue blossoms. Polemoniums prefer a cool, moist setting, in a well-drained soil. Plants suffer in hot, humid and wet conditions. Will continue to bloom well into the summer if weather conditions stay cool, and if spent flowers are removed. Division can be done in the spring or fall, and stem cuttings can be taken in the summer. Seed will germinate easily. The stems of 'Brise d'Anjou' are brittle. Occasionally, an all-green or all-white shoot my form on this plant; if so, remove that shoot.

Tuesday, November 10, 2009

Evergreen Ground Cover Of The Day

Hedera colchica 'Dentata Variegata'
Persian Ivy, Colchis Ivy

Type Groundcover, vine, woody plant

Hardy range 4B to 7A

Height 6" to 12" / 15cm to 30cm

Growth rate Fast

Form Prostrate and variable spread

Exposure Full shade to full sun

Persistence Evergreen

Bloom Color White

Bloom Time Fall

Environment

This plant tolerates some drought and some salt.

This plant will grow in dry soil.

Suitable soil is well-drained/loamy, sandy or clay.

The pH preference is an acidic to neutral (less than 6.8 to 7.2) soil.

Leaf Color Green, variegated and yellow

Fall Color No change in fall color

Culture Notes

Tolerant of full sun conditions, Persian Ivy in the southern part of its range does best in some shade on moist but well-drained soils. Plant on 12-inch centers from rooted cuttings. Pollen can cause mild allergy symptoms.

Ivy will usually not strangle a tree because stems ascend straight up the trunk and do not spiral around as do some other vines. However, before allowing ivy to climb a tree, consider that the added weight of the ivy on the limbs can contribute to branch failure and breakage. The tangle of stems and foliage can also hide decay and cavities in the trunk and branches which makes it difficult to evaluate the health and safety of the tree.