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Passiflora, Blue Passion Flower, Hardy Passion Flower, Passion Vine 'Clear Sky'

Passiflora caerulea

Family: Passifloraceae (pas-ih-flor-AY-see-ee) (Info)
Genus: Passiflora (pass-iff-FLOR-uh) (Info)
Species: caerulea (see-ROO-lee-uh) (Info)
Cultivar: Clear Sky


Vines and Climbers

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

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

Flowers are fragrant

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Suitable for growing in containers

This plant is suitable for growing indoors


over 40 ft. (12 m)


6-8 ft. (1.8-2.4 m)


USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

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

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

Sun Exposure:

Full Sun


Parts of plant are poisonous if ingested

Bloom Color:

Pale Green



White/Near White

Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Blooms repeatedly



Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


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


Chandler, Arizona

Chandler Heights, Arizona

Tucson, Arizona

Capistrano Beach, California

Fallbrook, California

Los Angeles, California

Ridgemark, California

San Jose, California

Pensacola, Florida

Pompano Beach, Florida

Saint Petersburg, Florida

Hammond, Louisiana

Canton, Ohio

Eugene, Oregon

Columbia, South Carolina

Conway, South Carolina

Greer, South Carolina

Sumter, South Carolina

Austin, Texas

Desoto, Texas

San Marcos, Texas

show all

Gardeners' Notes:


On Oct 9, 2014, peejay12 from Porthleven, Helston, Cornwall,
United Kingdom (Zone 9b) wrote:

The large flowers are what really distinguishes this from the bog-standard Blue Passionflower, so you should only buy a plant that's in flower (a good rule anyhow!). The flowers should be 10cm (4") across or over.

Again, this plant doesn't flower well in the UK unless the summer is sunny. It survives most winters, but can take a long time to recover if damaged to ground level. Planted by a SW wall near a patio will help it a lot.

It's a wonderful plant, but ---- think, if it was as hardy and wonderful as the traders tell us, why doesn't everyone in the UK grow it???? Eh???

I so envy all the US grdeners for being able to grow them so well!


On Jun 22, 2012, Catsar from Akron, OH wrote:

I received this plant on Mothers Day 2011. I planted it in a container, andI brought it indoors last winter; I live in Ohio. I went to prune it back this March and discovered another small plant growing in the container. I dug it out, replanted it, and took it outside. It proceeded to wilt so I brought it back in and placed it in a glass with a small amount of water. After it got a bunch of roots on it I replanted it and took it back outside where it is thriving. It is soon to out grow the pot I put it in. As I was watering the mother plant today (6/22/12) I noticed another plant coming up through the soil. When it gets big enough I will pull it out, put it in water, and wait for the roots to form. From one plant I will now have 3.


On May 31, 2010, Kiyzersoze from Coral Springs, FL (Zone 10b) wrote:

I love this Passion Vine but so do the caterpillars. I have lost several of these because as soon as I plant them the caterpillars eat them to the point that they have not recovered. Like my husband tells me though, if you want to have butterflies you have to have caterpillars.


On Jun 13, 2008, dcroyle1 from Chandler, AZ wrote:

Planted as 1 gallon in Oct by June was 10' by 10'. Planted on block wall with a south face. Gulf butterfly loves plant. Blooms better than Lady Lavender Passion vine and in June covered in blossoms. Plant is mixed in with snap dragons so it gets extra water 1 gallon/day in summer.


On Jun 6, 2008, stephenp from Wirral, UK, Zone 9a,
United Kingdom (Zone 9a) wrote:

Growing this in UK, very rampant indeed, needs pruning regularly. A great addition to a tropical garden. I live in zone 9a so it is evergreen year round but in zones 8 and below it tends to be deciduous.


On Jun 23, 2005, kbaumle from Northwest, OH (Zone 5b) wrote:

An unbelievable tetraploid developed by Roland Fischer in Germany in 2001. The same vigor and hardiness as the standard Blue Crown Passionflower, but with blooms twice the size! The blooms have darker color in the center.