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Hibiscus – White Pillar® – Rose of Sharon – Hibiscus syriacus

Garden Height
120 - 192
Spacing
24 - 36
Spread
24 - 36
Habit
Upright
Container Role
Thriller
Flower Size
Tall
Flower Colors
White
Light Level
Sun
Proven Winners

Resists: Deer

Fun Facts

The technical term for plants that grow tall and narrow like the Pillar series of rose of Sharon is "fastigiate" (pronounced fa-stidge-itt). 

Maintenance Notes

Rose of Sharon requires essentially no special care. A good 2-3" layer of shredded bark mulch would be a welcome addition to the root zone. Pruning is rarely required but can be done in early spring. If you wish to fertilize, a granular fertilizer formulated for woody plants, like a rose fertilizer, can be applied in early spring, once the ground has thawed.

Rose of Sharon can be quite late to leaf out in spring, so do be patient.

Uses Notes

The only limit to the uses of the versatile, unique rose of Sharon is your imagination! We do recommend it get a minimum of six hours of bright sun for best looks and performance. 

Maintenance Category Easy

Water Category Average

Blooms On New Wood

Bloom Time

Flower Form Border Plant, Container, Good for Screening, Landscape, Mass Planting, Specimen or Focal Point

pH C - pH 6.0 - 6.5

EC (2:1 Extraction Method) 1 - 1.5

Fertilization 100 - 200

Light Requirements High

Water Requirements Moderate to Moist

Rooting Out Temperature 65 - 72° Fahrenheit

Growing On Temperature 70 - 75° Fahrenheit

Holding Temperature 65 - 72° Fahrenheit

Planting and Timing Information

Plant in spring for Summer Finish. 1 ppp.

Pinching and Growth Regulators

With liner grown plants, to encourage branching, soft pinch when the shoots are 2-3 inches long leaving 4-6 leaves on each branch. Allow at least 6 weeks from pinching until the desired bloom date. If using liners in larger pot sizes, additional pinches may be necessary.

With bare root grown plants, pinch when new growth is 4-8 inches tall, leaving 4 to 6 leaves below the pinch. Allow at least 6 weeks from pinching until the desired bloom date.

Plants grown outdoors should not need growth regulator applications.

When grown in greenhouses, spray multiple applications of the tank mixture of B-Nine at 3750 ppm and Cycocel at 1000 ppm or Sumagic alone at 7.5 ppm.

It is best to begin PGR applications about 3-5 days following a pinch and apply them at 7 day intervals, if additional control is necessary.

Pest and Disease Management

Standard pest and disease practices as stated in the notes.

Aphids, spider mites and whiteflies may be problematic, scout and treat as necessary.

Grower Tips

-Plant the crown (where the roots meet the stem) just below the media surface. Bare root plants will have woody stems that can be several inches long, these will be above the ground.

-These are heat loving plants and they can be grown up to 80 degrees, just be sure the plants do not dry out.

-High light produces better branching, more flowers per plant and shorter plants.

-Never allow the plants to wilt or lower leaf yellowing, bud abortion and lower quality will result.

-These are vigorous plants and proper plant spacing is necessary for high quality plants, do not overcrowd.

-Summer Storm is a dark foliaged plant, however, the foliage color only develops with direct sunlight.

-Bare root plants can usually be potted and grown directly outdoors in late spring. Protect the plants from extreme cold as needed.

-Bare root plants should be used only in 2 and 3 gallon containers.

-Liners can be grown in gallon or larger containers. If using liners in 3 gallon containers you may want to use 2 to 3 liners.

-In climates with very mild winters, plants may be very late to emerge from dormancy.