Tall Morning Glory 'Joyce Cobb'

Ipomoea purpurea

Family: Convolvulaceae (kon-volv-yoo-LAY-see-ee) (Info)
Genus: Ipomoea (ip-oh-MEE-a) (Info)
Species: purpurea (pur-PUR-ee-uh) (Info)
Cultivar: Joyce Cobb



Vines and Climbers

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Full Sun

Sun to Partial Shade

Light Shade



Foliage Color:

Unknown - Tell us


4-6 ft. (1.2-1.8 m)

6-8 ft. (1.8-2.4 m)

8-10 ft. (2.4-3 m)


3-6 in. (7-15 cm)

6-9 in. (15-22 cm)


Not Applicable

Where to Grow:

Can be grown as an annual


Seed is poisonous if ingested

Bloom Color:

Fuchsia (red-purple)


White/Near White

Bloom Characteristics:

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

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Blooms repeatedly

Other details:

May be a noxious weed or invasive

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

From seed; direct sow outdoors in fall

From seed; winter sow in vented containers, coldframe or unheated greenhouse

Direct sow as soon as the ground can be worked

From seed; sow indoors before last frost

From seed; direct sow after last frost

From seed; germinate in a damp paper towel

From seed; germinate in vitro in gelatin, agar or other medium

Scarify seed before sowing

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Allow pods to dry on plant; break open to collect seeds

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored


This plant is said to grow outdoors in the following regions:

Elk Grove, California

Grass Valley, California

Moreno Valley, California

San Diego, California

Temple City, California

Zephyrhills, Florida

Tower, Minnesota

Carson City, Nevada

Mesquite, New Mexico

Dundee, Ohio

Zanesville, Ohio

Lafayette, Tennessee

Plano, Texas

Chesapeake, Virginia

show all

Gardeners' Notes:


On Oct 25, 2006, zville123 from Zanesville, OH (Zone 6a) wrote:

I grew 4 'Joyce Cobbs' this year. Two looked like OhioBreezy's pictures (probably because I did get some of the seeds from her LOL). One was almost white with light purple markings. Another was a darker purple than the pictures by OhioBreezy. We ran heavy duty fishing line (next time we'll use something heavier) up to an old antenna bracket close to our roof (we live in a 2 story Cape Cod). The MGs scrambled right up to the roof. When we looked out one of the bedroom windows in the AM, we could see a wall of 'Joyce Cobb.' I'll definitely be growing these again. They do seed heavily...all the more to share with our neighbors who loved them, too!


On Aug 31, 2006, rh3708 from Westmoreland, TN (Zone 7a) wrote:

I have grown this MG for 2 years now and it's one that turns heads every time.
The bloom is small 2 1/2 inches but the white in the center makes it jump out at you when you see it growing in the tree in my yard.
Its a keeper in my collection of purpurea that i grow since i came here.



On Aug 30, 2005, Gourd from Mesilla Park, NM wrote:

This is real gem of a Morning Glory. It makes such a splash and just stops you in your tracks.

The heat here does almost melt the flowers by 11 AM. But, I feel that if it is grown in a colder climate, the blooms should last open longer.

This one in particular reseeded itself. I will definitely grow alot more of this one if I get seeds.


On Jul 8, 2004, OhioBreezy from Dundee, OH (Zone 5b) wrote:

A very pretty bloomer, starts out darker purple in color with dots, as it "fades" it is more of a pretty pinkish color wth spots, lovely!!