Grow and Care for Convolvulus

Grow Convolvulus in full sun with soil that drains fast. Shops also say dwarf morning glory.

Give it full sun and sharp drainage — keep winter wet off silverbush

Full sun is the bloom gate. In hot summers, the compact annual still wants morning sun, with a little afternoon shade so the leaves do not scorch. [1]

Drainage decides whether silverbush lives. Give it light soil and fast drainage, then water moderately in growth — not a soggy clay pocket. [2]

Protect silverbush from extra winter moisture. Let the mix dry between thorough waterings in summer, and keep the crown out of standing water when nights turn wet. [3]

Prune silverbush to renew the mound

1. Wait until the main flush of white funnels drops.
2. Cut the mound back to renew leafy growth. Do not shear it weekly like a box hedge into old wood.
3. Empty saucers so water does not sit on the crown through winter.

Grow Blue Ensign in a pot that drains

A hanging basket or patio pot with drainage holes is the easy win for summer color. Use a free-draining mix, water when the top is dry, and empty the saucer after rain. Silverbush in terracotta needs the same dry-down, plus winter cover where hard freezes hit.

Start Blue Ensign from seed after frost

Blue Ensign is a compact, non-vining annual. Start it after frost, or count back four to six weeks indoors. It is not a fence vine, and it does not need a trellis.

1. Count back four to six weeks from your last frost to start seed indoors, or wait and sow outdoors after frost risk.
2. Sow on well-drained mix and barely cover the seed.
3. Set nursery plants at the same depth as the pot after frost. Water once to settle.
4. Pinch soft tips once for denser mounds. Deadhead spent flushes — each flower lasts about a day, then the next opens.

Blue Ensign, silverbush, and the trailers

Match the tag to the habit before you copy a neighbor's watering. The nickname bindweed is useless without the species.

Dwarf morning glory

C. tricolor ‘Blue Ensign’ is the compact annual for sunny beds and pots. Flowers are blue with a white throat and a yellow eye on the classic Blue Ensign look. Shop names such as Royal Ensign are the same compact annual, not a second species to hunt.

Silver evergreen shrub

C. cneorum is silverbush — silky silver leaves and white funnels on a mound about two feet tall by three feet wide in a mild climate. It is a shrub, not a basket trailer.

Trailing warm-climate mats

C. sabatius trails as a drought-lean mat on banks, walls, and warm rock gardens, about one to two feet tall by two to three feet wide. C. althaeoides adds pink bloom with more vigor — plant it where you can cut the edges, not beside a vegetable plot you need clean.

Not field bindweed — and not a climbing morning glory

Ornamental Convolvulus is a named nursery plant. Field bindweed (Convolvulus arvensis) is a perennial weed. Its roots can run about twenty feet down, pieces of root regrow, and seed can sit in soil for decades. Do not plant it as a groundcover. [4]

Climbing morning glory is Ipomoea — a vine on a trellis with larger flowers and a thicker stem. Blue Ensign does not twine. If the packet says morning glory and shows a fence covered in vines, that is not this genus.

Blue My Mind on the tag is Evolvulus

Shops often sell Proven Winners Blue My Mind as dwarf morning glory. That plant is Evolvulus, a fuzzy silver-green trailer with true-blue flowers, not Convolvulus. Do not copy its care onto silverbush, and do not treat Blue Ensign as that annual.

Check the scientific name on the tag, then plant into grit in full sun.