How to Grow and Care for Ivory Silk Lilac Tree

Ivory silk lilac, a popular low-maintenance cultivar of the Japanese lilac tree, grows a little shorter than the species plant. It is a single-trunked small tree or large shrub with panicles of creamy white flowers with very little fragrance. Ivory silk lilac grows best in cooler climates and requires full sun and well-draining neutral pH soil.

Ivory Silk Lilac Care

Here are the basic requirements to grow ivory silk lilac.

• Plant in full sun.
• Place in any type of soil as well as it is well-draining.
• Water a young ivory silk lilac weekly during the growing season, but it will become drought-tolerant as it matures.
• Prune in the winter before its growth period.

Light

This tree needs full sun. A partially sunny or shaded location reduces the number of flowers. If it is in a sunny spot, your tree will explode with huge white clusters of blooms.

Soil

An appealing aspect of the ivory silk lilac is its ability to grow in poor soil conditions and even where soil may be rocky or compressed. The ideal soil is average, rich in organic material, well-draining, and neutral to slightly alkaline.

Water

Ivory silk lilac is somewhat drought tolerant. However, in extremely dry weather, the tree appreciates supplemental water.

Water a young tree for the first two seasons to establish a strong root system and apply a layer of mulch around the base of the tree out to the drip line. Water a newly planted tree weekly at a rate of a gallon per trunk diameter at chest height.

Temperature and Humidity

Ivory silk lilac is not especially cold-hardy though it will only thrive in the limited and cooler USDA ranges of zones 3 through 7. However, it will not do well in hot, humid climates.

Fertilizer

Applying a yearly feeding of a general extended/slow-release fertilizer formulated for ornamental flowering trees is recommended to help keep your ivory silk lilac in shape. Applying the fertilizer lightly in the spring once frost has passed should keep your tree happy and encourage plenty of blooms and foliage.

Types of Ivory Silk Lilac Trees

'Ivory Silk' is just one unique cultivar of Syringa reticulata. Many cultivars of the species look different from 'Ivory Silk' with varying traits, including:

• Syringa reticulata' Chantilly Lace': This multi-stemmed cultivar has creamy yellow variegated leaves.
• Syringa reticulata 'Summer Snow': This is a small cultivar with a compact form but with very large flower clusters.
• Syringa reticulata 'Summer Storm': This cultivar is known for its fast growth and is considered slightly more hardy in colder weather.

Pruning

After a few years, it is normal for an ivory silk lilac to produce fewer blooms. Maintenance pruning rejuvenates the tree and encourages new growth. Trim away1/3 of your tree’s largest stems. Prune annually while the tree is dormant and before new growth appears.

Common Pests and Plant Diseases

The ivory silk lilac is not bothered by many insects. Borers may annoy the tree but it is not a serious problem. However excessive boring into the branches may weaken them and they will break off. Prevent infestation by keeping your tree stress-free with water and regular fertilizing in overly dry weather. If borers attack, remove the infested, damaged branches and dispose of them responsibly.

Several diseases can affect the species, such as bacterial blight (a common concern for white-flowered cultivars). Blight is especially prevalent during wet weather and when over-fertilizing with nitrogen-heavy fertilizers. Verticillium wilt is a concern, but proper fertilizing and proper tool sanitation are the best ways to avoid this problem.

How to Get Ivory Silk Lilac to Bloom

Bloom Months

Ivory silk lilac blooms in the summer months of June and July. The bloom period is short, however, lasting a couple of weeks.

What Do Ivory Silk Lilac Flowers Look and Smell Like?

Ivory silk lilac produces panicles of creamy white blossoms but they do not have much of a scent.

How to Encourage More Blooms

Ivory silk lilac trees need a location in full sun to produce an abundance of blooms.

Deadheading Ivory Silk Lilac Flowers

Deadhead faded flowers to encourage more growth and blooming.

Common Problems With Ivory Silk Lilac

Ivory silk lilac has minimal upkeep as long as it's placed in the right spot. Even though, no plant is immune to every problem so keep an eye out for a couple of signs that may need to be addressed.

Wilting Flowers

Wilting flowers may indicate too much fertilizer or nitrogen in the soil.

Leaf Drop

Defoliation may occur on ivory silk lilac trees planted in too much shade. The trees may be afflicted by powdery mildew, which can cause leaf drop.

Black Spots on Leaves

If the tree has bacterial blight, black spots or stripes may also appear on leaves and stems. Leaves will turn black and die. Wet weather causes this problem. Thin out extra shoots in the tree to give the plant air circulation.

From: thespruce