Natives of North America and the Mediterranean
The annual forms are to be preferred to those
of perennial character as the latter often prove
to be very difficult to control. The leaves are
heart-shaped and the flowers funnel-shaped and
wide open at the mouth; the habit either twining
The finest, Convolvulus tricolor (syn. Convolvulus minor), the
dwarf Morning Glory from southern Europe, grows
about a foot high, with three-inch diameter blue
flowers, with a yellow throat margined white.
There are forms with various coloured flowers,
and one, considerably less charming, with white
Perennials, usually treated as annuals, are Convolvulus
undulatus, a twiner up to four feet with clusters
of mid-blue flowers; Convolvulus elongatus, a wall plant,
desirable for its small white flowers; and Convolvulus
aureus superbus, from North America, distinct
in having golden-yellow flowers on twining growths
up to four or five feet.
All are easily grown from seed sown in well-drained
soil in full sun in March.
Propagation is from seed.
The flowering season is from June to September.
See Also Convolvulus Major