Convolvulus siculus

Growing in Pots, Balconies & Indoors

Convolvulus siculus is a low, trailing annual bindweed – only about 30 cm (12 in) tall but spreading 0.8-2 m (2.5-6 ft) wide. It is not a houseplant; it needs full sun, and the grower flags it as invasive/aggressive, so a contained pot outdoors is the safe way to enjoy it.

Quick Details

• Container Size: A pot or hanging basket that lets its long stems trail
• Indoor Suitability: Not a houseplant – it needs full sun
• Best Spot: Full sun to half shade outdoors
• Soil & Drainage: Ordinary free-draining potting mix
• Watering in Pots: Small amounts – it is fairly drought-tolerant

Indoors & On the Windowsill

• Not indoors: The grower marks it unsuitable indoors – it is a sun-loving trailer that will thin and stop flowering in room light.
• Seasonal: Grown as an annual, it lasts a season; there is nothing to overwinter.
• Note: The grower flags it as invasive and aggressive – keep it in a contained pot away from open ground and remove seed heads.

On a Balcony or Patio

• Light: Give it the sunniest spot; it trails attractively from a pot edge or basket in full sun.
• Practicalities: Because it self-seeds and spreads aggressively, deadhead and do not let it escape into beds below the balcony.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A pot or basket with strong drainage holes; skip a standing-water saucer.
• Potting mix: Ordinary free-draining potting mix.
• Feeding: Light feeding only; over-rich pots give leaf at the expense of flowers.
• Repotting: Not needed for a single-season annual – resow each year.

Bloom & Flower Guide

Quick Details

• Bloom Season: Most of the year in mild climates
• Flower Appearance: Small, rounded funnel-shaped flowers with fused petals, in purple or blue
• Edibility: Ornamental only; the flowers are not eaten.

Detailed Blooming Overview

This little bindweed relative carries the family’s classic funnel flowers, with petals fused into a rounded, five-angled face. The purple-to-blue blooms open in the light and can appear over most of the year where the climate is mild, threading through the plant’s trailing stems.

Flower Characteristics

• Rounded, funnel-shaped flowers with merged petals.
• Colours in purple or blue.
• Flowers open in sunlight and close in dull conditions.

Bloom Care & Thinning

• Encouraging flowers: A sunny, open position gives the fullest flowering; the blooms need good light to open properly.
• Managing spread: It self-seeds readily, so trim back or remove spent flowers if you want to keep it contained.