Light Bulb Clerodendrum

Clerodendrum smithianum

Family: Lamiaceae (lay-mee-AY-see-ee) (Info)
Genus: Clerodendrum (kler-oh-DEN-drum) (Info)
Species: smithianum


Tropicals and Tender Perennials

Vines and Climbers

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Suitable for growing in containers


4-6 ft. (1.2-1.8 m)

6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 m)

10-12 ft. (3-3.6 m)


24-36 in. (60-90 cm)

36-48 in. (90-120 cm)


USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:

Partial to Full Shade

Full Shade


Unknown - Tell us

Bloom Color:

White/Near White

Bloom Time:

Late Winter/Early Spring

Late Fall/Early Winter

Mid Winter



Other details:

Unknown - Tell us

Soil pH requirements:

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

Patent Information:

Unknown - Tell us

Propagation Methods:

From semi-hardwood cuttings

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Delray Beach, Florida

Fort Lauderdale, Florida

Lakeland, Florida

Mulberry, Florida

Tampa, Florida

Austin, Texas

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Gardeners' Notes:


On Jan 5, 2011, Ng68 from Austin, TX wrote:

Indeed it's a very rare plant. I searched all over the web for info but found only 2 sites one being DG and the other where I bought the plant. I bought the plant from rare flora website and it reached me very safely in the winter. But the calyces are not as showy as shown in the pics. Mine are just pale green with small white flower bulbs. I was wondering if this is an other species or will it take for a while to grow to show the true colors. If anyone has any more info on this plant pls post.


On Dec 28, 2009, popper1 from Lakeland, FL (Zone 10a) wrote:

This is a very rare Clerodendrum, very hard to find, but so worth the effort. Looks much like Clerodendrum thomsoniae in growth habit. The white flowers are like many other Clerodendrum flowers with long, protruding anthers and style. What is different is the flower buds, they look like little light bulbs hanging on the inflorescence. The flowers are plentiful, widely spaced on the numerous, wiry inflorescences. A very cool plant.