Species

Hibiscus syriacusRose of Sharon

34 other cultivars

shrub

Gandini Santiago Purple Pillar Rose of Sharon

Hibiscus syriacus 'Gandini Santiago'

The Story

Plant Bio

Hibiscus syriacus, or Rose of Sharon, is a hardy, deciduous shrub valued for its large, tropical-looking flowers in late summer when few other shrubs are blooming. It has an upright, vase-shaped habit.

Purple Pillar ('Gandini Santiago') is a unique selection with a very narrow, fastigiate growth habit, reaching up to 16 feet tall but only 2-3 feet wide. It produces large, semi-double lavender-purple flowers with a red eye, offering vertical interest without taking up much garden space.

Uses & Benefits:

Its primary value is its tight, columnar habit, which provides a strong vertical element in the landscape. The large, exotic-looking lavender flowers offer high-impact color in late summer when garden color is often fading.

Perfect for creating a narrow hedge or privacy screen in tight spaces, such as between houses or along a driveway. It can also be used to frame an entryway or as a dramatic focal point in a large container.

The large, nectar-rich flowers are a magnet for pollinators, including hummingbirds, bees, and butterflies, providing a crucial late-season food source.

SpeciesHibiscus syriacusRose of Sharon

Essentials

At a Glance

Plant Type

Shrub

Height

192 inches

Width

36 inches

Light

Full Sun

Zones

5, 6, 7, 8, 9

Water

Medium

Humidity

Adaptable

Lifespan

20-30 years

Native To

Asia

Toxicity

Non-toxic

Bloom period

Mid-summer – Early fall

In flower about 3 months of the year

Planting

How to Grow

Choose a location in full sun with well-drained soil.
Dig a hole twice as wide as the root ball.
Set the plant in the hole, ensuring the top of the root ball is level with the soil.
Backfill with soil and water thoroughly.
Keep the soil consistently moist during the first year.
Mulch to conserve moisture and reduce weed competition.

Pro Tip

Plant in full sun for the sturdiest stems and most prolific blooming. Its narrow form rarely needs pruning to maintain its shape.

Keep It Thriving

Care Guide

Do

Provide at least 6 hours of direct sun daily.
Water deeply during hot, dry periods to encourage lush growth.
Fertilize in spring to support vigorous growth and flowering.
Use it as a narrow screen where a traditional hedge won't fit.

Don't

Don't plant in shady locations, which leads to weak stems and poor flowering.
Avoid planting in soil that stays constantly wet.
Don't perform heavy pruning, as it will ruin the natural columnar shape.
Don't worry if it's slow to leaf out in spring; this is typical for Rose of Sharon.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Fertilize
Pest Check
Prune

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Dramatic vertical accent for narrow spacesColorful and unique privacy screen or hedgeTall 'thriller' element in large containers

Companion Plants

Echinacea purpurea 'Magnus'Perovskia atriplicifolia Sedum 'Autumn Joy'Pennisetum alopecuroides 'Hameln'Hydrangea paniculata 'Limelight'

Multiply

Propagation Methods

Good to Know

Common Questions

Gandini Santiago Purple Pillar Rose of Sharon questions

What zones can Gandini Santiago Purple Pillar Rose of Sharon grow in?

Gandini Santiago Purple Pillar Rose of Sharon is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Gandini Santiago Purple Pillar Rose of Sharon deer resistant?

Yes — Gandini Santiago Purple Pillar Rose of Sharon is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Gandini Santiago Purple Pillar Rose of Sharon bloom?

Gandini Santiago Purple Pillar Rose of Sharon typically blooms in mid-summer through early fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Gandini Santiago Purple Pillar Rose of Sharon need full sun?

Gandini Santiago Purple Pillar Rose of Sharon does best in full sun (6+ hours).

Is Gandini Santiago Purple Pillar Rose of Sharon drought tolerant?

Yes — once established (usually after the first full season), Gandini Santiago Purple Pillar Rose of Sharon handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.