Convolvulus sabatius care in pots, for a sunny balcony
This trailing perennial from Italy and North Africa covers itself in lilac blue flowers through the warm months, as long as it gets full sun and soil that dries out between waterings. It belongs on a sunny, sheltered balcony or terrace. This page covers the light, the watering, the trimming, the winter cold and the cuttings.
- Full sun on a sheltered balcony or terrace. An indoor wall is too dark for it to flower.
- Water only when the soil is dry a finger deep, and keep it drier in winter.
- Trim stems that run too long. In a pot, shelter it from hard frost and winter rain.
What Convolvulus sabatius is, and what else is sold as convolvulus
Convolvulus sabatius, sold as blue rock bindweed, ground morning glory or under its older name C. mauritanicus, is a trailing perennial from Italy and North Africa. The RHS describes a woody-based plant that forms a mat up to 20 cm high, with small oval leaves and wide, funnel-shaped flowers in purplish blue.
The flowering season shifts with the climate. The RHS lists flowers in summer and autumn for British gardens, and the Diputació de Barcelona’s urban planting catalogue gives spring and summer for the coast and the inland areas of the province.
Bindweed is the word that worries people, because field bindweed, Convolvulus arvensis, is one of the hardest garden weeds to get rid of. It is a different species. NC State Extension lists it as an invasive weed in 35 US states, spreading by seed, roots and rhizomes.
The table sets apart what you may find on a label. The plant care guide lists every other plant on the site by the light and water it takes.
| Name on the label | What it is | How it grows | Plant it? |
|---|
| Convolvulus sabatius, blue rock bindweed | The species this page covers | A low trailing mat with lilac blue flowers | Yes, in full sun |
| Convolvulus mauritanicus | An older name for the same plant, still on many labels | The same | Yes, same care |
| Field bindweed, Convolvulus arvensis | A weed from Europe and Asia | A twining vine with white or pink flowers and spreading roots | No |
How much sun Convolvulus sabatius needs
Full sun, which means direct sun on the plant for most of the day. NC State Extension defines full sun as six or more hours of direct sunlight a day, and the RHS lists this plant for full sun only, on a south or west facing aspect.
On a building that means a balcony or terrace where the sun actually lands on the wall for most of the day. A south facing balcony in Barcelona gives it that from spring to autumn, and a west facing terrace in Lyon gets the afternoon sun. A north facing wall gets almost no direct sun all year, so it will not do.
Shelter matters as much as sun. The RHS asks for a sheltered exposure, and a windy balcony in Amsterdam is the case to plan for. Put the plant in the protected corner, close to the house wall, where the long thin stems are not thrown about. On the same sunny wall, lavender wants the same dry, gritty mix.
How often to water Convolvulus sabatius in a pot
Water when the soil is dry a finger deep, slowly, until the whole root ball is damp, then let it dry again. The plant itself takes little water. The RHS rates it drought resistant and the Diputació de Barcelona lists its water use as low.
A pot is not a garden bed, though. A small volume of soil in full sun dries far faster than open ground, and the RHS asks you to check containers for moisture more often in warm or windy weather. The same RHS page names overwatering as the most common cause of losing a container plant, so the aim is soil that is moist and never soggy.
In winter the plant barely grows, the RHS lists it as deciduous, and a dormant plant in a pot seldom needs water. Leave it be when frost is forecast. A trip away in July is the opposite problem, and DIY drip irrigation compares the bottle, bucket and tubing setups that keep a sunny pot going.
Soil and feeding for Convolvulus sabatius in containers
A gritty, free-draining mix and very little feed. The RHS asks for gritty, well-drained soil and accepts chalk, loam or sand, at an acid, neutral or alkaline pH.
- The mix. Peat-free multipurpose compost with a few handfuls of coarse grit worked through it, so water passes through instead of sitting at the bottom.
- Lime. Not a problem. The Diputació de Barcelona catalogue lists it as resistant to lime, and the RHS accepts alkaline soil.
- Feeding. A controlled-release fertiliser mixed in at planting, which is the RHS method for plants that stay in the same pot for a long time. Feeding stops from late summer until mid spring, and in winter it is not needed at all.
- Repotting. Roots eventually fill any container and growth slows, the RHS notes. When that happens, refresh the compost or move the plant to a bigger pot.
How to trim Convolvulus sabatius
Trim it whenever the stems run further than you want them to. The RHS entry gives no fixed date and says to trim as required, and the Diputació de Barcelona lists it as tolerant of pruning.
How far it runs depends on where it grows. The RHS gives 10 to 50 cm of spread and the Barcelona catalogue 50 to 70 cm, so on a wall the stems can hang well below their pot.
The Barcelona catalogue also flags a potential to spread into the wild. Put trimmings and old plants in the organic waste bin, never on waste ground or a verge.
- Wait for new shoots in spring before you cut anything back hard.
- Cut out any stem that stays bare once the rest of the plant has leafed out.
- Shorten stems that run too long, cutting just above a leaf.
- Through summer, pinch out tips that wander into the space of the plant beside it.
Convolvulus sabatius in winter, outdoors or under cover
The RHS rates it H3, hardy in coastal and relatively mild parts of the UK, a band it puts at −5 to 1 °C. The Diputació de Barcelona lists it as frost tolerant on the coast and inland, so on a Barcelona balcony it stays out all year.
In a pot the roots sit above the ground with little soil around them, and the RHS names compost freezing as the main winter danger for container plants.
Where winters are harder, as on a terrace in Lyon, move the plant close to the house wall before the first frost, cover it with fleece on cold nights or bring it under cover, all of which the RHS suggests for pots. On a wet balcony in Amsterdam the rain is the bigger risk, and the rain shadow at the foot of a wall or under an overhang keeps the soil from staying sodden.
Do not judge the plant by its bare stems. The RHS lists it as deciduous and the Barcelona catalogue as evergreen, so it may keep its leaves through a mild winter and lose them in a cold one. Wait for spring growth before you decide what has died.
Is Convolvulus sabatius toxic to cats and dogs?
No poison-control service rates it, so nobody can tell you it is safe. The ASPCA has no entry for this species or for any Convolvulus, checked in October 2026.
The entry that comes up for "morning glory" is a different genus in the same family. The ASPCA lists morning glory, Ipomoea, as toxic to dogs, cats and horses, with vomiting as the sign, and that entry says nothing about this plant.
For people, the Diputació de Barcelona catalogue records no allergies or adverse reactions. If you have a pet that chews plants, keep this one out of its reach, and call your vet if it has eaten some and seems unwell.
Convolvulus sabatius on the wall
Convolvulus sabatius belongs on an outdoor wall, on a sunny balcony or terrace, and the canvas works there as long as the wall is sheltered. The pocket is recycled PVC with a geotextile layer inside and takes the weather. The wooden board is the part that must stay out of standing rain. Other ways to plant an outdoor wall are compared in living wall systems.
The Medium pocket holds 1.8 litres of substrate, about what a 15 cm pot takes, which is room for one young plant. Its stems trail over the front edge and down the board, and with the RHS spread of up to 50 cm, a trim keeps them off the pocket below. The Small and Mini pockets hold 0.45 and 0.23 litres, which is room to root a cutting. That small volume in full sun is why the finger test comes before every watering.
The board hangs by a slot near its top on one wall hook, so the wall takes one hole, drilled or nailed. An outdoor wall is usually brick or render, which takes a drill and a standard plug, and the mounting steps start there.
- Mix a few handfuls of coarse grit through the substrate before you fill the pocket.
- Take a young plant out of its nursery pot and loosen the roots.
- Set it at the depth it grew before, with the stems lying over the front edge.
- Water slowly, in measured amounts, then let the top dry before the next watering.
Convolvulus sabatius problems and how to fix them
The RHS calls it generally pest-free and lists honey fungus as a rare disease, so almost everything that goes wrong in a pot comes from the spot or the watering. Too little sun shows as stems and leaves without flowers. Too much water shows first at the base of the stems.
| What you see | Why | The fix |
|---|
| Long thin stems, few flowers | Too little direct sun | Move it to the sunniest sheltered wall you have. |
| Stems soft at the base, plant wilting in wet soil | Soil kept wet, the most common way pot plants are lost | Stop watering, let it dry and repot into gritty mix. |
| Wilting at midday, soil dry | The pot dried out in sun or wind | Water slowly until damp throughout, and check more often in hot spells. |
| Bare stems after winter | Leaf drop in a cold winter, or frozen roots | Wait for spring shoots, then cut out what stays bare. |
| Stems battered or snapped | An exposed, windy spot | Move it to a sheltered corner near the house wall. |
| Stems trailing far below the pot | The normal spread of the species | Trim them back to a leaf as often as needed. |
If the leaves are yellowing and nothing in the table fits, yellow leaves reads the pattern on the leaf to separate water, light and age.
How to propagate Convolvulus sabatius from cuttings
The RHS propagates it by seed or softwood cuttings. A softwood cutting is the soft tip of a shoot grown this season, taken in spring or early summer, and the RHS calls these the stem cuttings that root most readily.
- Early in the day, cut a shoot tip that has no flowers on it.
- Trim it just below a leaf joint to 5 to 10 cm long, the RHS length.
- Strip the lower leaves and pinch out the soft tip.
- Push it into a small pot of peat-free cutting compost, with the first pair of leaves just above the surface.
- Cover it with a clear bag in a warm spot with good light but no direct sun, and open it now and then to let air in.
- Pot it on into gritty mix once new growth shows.
The RHS advises potting softwood cuttings by midsummer so they root well enough to survive the winter. A cutting taken in late spring gives you a young plant to fall back on if a hard winter takes the parent.
Is Convolvulus sabatius the same as bindweed?
No. The weed people call bindweed is field bindweed, Convolvulus arvensis, a twining vine that NC State Extension lists as invasive and hard to eradicate because of its spreading roots. This species forms a low trailing mat, though the Diputació de Barcelona still flags a potential to spread, so keep it out of the wild.
Can Convolvulus sabatius grow indoors?
Not as a flowering plant. Every source that rates it puts it in full sun outdoors, and a wall inside a room never gets direct sun for most of the day. For a trailing plant indoors, indoor hanging plants covers the species that cope with room light.
Does it come back every year?
It is a perennial, so it does where winter stays within what it takes. The RHS rates it H3, hardy in mild and coastal areas, and in a pot the roots are more exposed to frost than in the ground. Shelter it through hard frost and wait for new shoots in spring.
When does Convolvulus sabatius flower?
Through the warm months. The Diputació de Barcelona gives spring and summer for the Barcelona area, and the RHS summer and autumn for British gardens. Both put it in flower in summer.
Can I hang it on a balcony wall without drilling?
The canvas needs one hole for its single wall hook, drilled or nailed. A drill-free fixing has to hold the pocket at its wet weight, and hang plants without drilling covers what each fixing holds.
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