Viola tricolor

Growing in Pots, Balconies & Indoors

Viola tricolor (heartsease) is a small, cheerful cool-season bedding plant. The grower marks it as not a houseplant, but its compact size makes it easy to grow in pots, window boxes and on a bright windowsill; the flowers are also edible.

Quick Details

• Container Size: A small pot, window box or basket of about 1-3 L (0.2-0.8 gal); it stays compact
• Indoor Suitability: Not a true houseplant, but a compact grower for a bright, cool sill or window box
• Best Spot: Full sun for the most flowers, or light (half) shade; it prefers cool conditions
• Soil & Drainage: Free-draining potting mix kept evenly moist
• Watering in Pots: Water regularly – small pots dry out quickly – without waterlogging

Indoors & On the Windowsill

• Houseplant limits: The grower marks it as not a houseplant; in a warm, dim room it stretches and stops flowering.
• Windowsill growing: On a bright, cool sill it flowers happily – it is small, quick and undemanding, and dislikes summer heat more than cool light.
• Overwintering: It is hardy and short-lived; in mild spells it flowers on cool sills or sheltered pots, and it self-seeds readily.

On a Balcony or Patio

• Light & season: A bright balcony suits it in the cooler parts of the year; give some afternoon shade where summers are hot, and keep the small pots watered.
• Practicalities: Allow for the weight of a filled pot and for drainage runoff onto the balcony below – stand pots on feet or a tray you can empty.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A small 1-3 L pot, window box or basket with good drainage. Use strong drainage holes and skip a standing water saucer, which invites root rot; terracotta breathes and dries fast, while glazed or plastic pots hold moisture longer.
• Potting mix: A light, aerated mix – potting compost, or peat/coir with added perlite or vermiculite for drainage.
• Feeding: A light regular feed keeps the flowers coming, as small pots leach fast.
• Repotting: Usually grown fresh each season; deadhead often and refresh the mix for repeat plantings.

Bloom & Edible Flower Guide

Quick Details

• Bloom Season: Spring through autumn in cool climates; winter to early summer in warm ones
• Time to First Bloom: Fast – within a few weeks of transplanting
• Flower Appearance: Small tricolour face, 2-4 cm, purple above, paler purple or white in the middle, with a yellow throat
• Edibility: The flowers are edible – mild-flavoured, used fresh in salads, as a garnish and in tea

Detailed Blooming Overview

Wild pansy, or heartsease, flowers generously over a long season with cheerful little “faces”. Each bloom carries three colours: purple at the top, lighter purple or white through the middle, and a yellow eye at the centre. The flowers are genuinely edible and make a pretty finish to a dish.

Flower Characteristics

• Small tricolour flowers, roughly 2-4 cm across.
• Purple upper petals, lighter middle and a yellow inner throat.

Bloom Care & Thinning

• Thinning the bloom: As each flower begins to fade, remove it with its stem to keep the plant flowering and to limit self-seeding.
• Pollination: Carried out by bees and butterflies.

Bloom Health & Protection

• Aphids and slugs: Aphids gather on buds and slugs nibble the flowers – because the blooms are eaten, favour hand-removal, a strong jet of water or insecticidal soap over harsher sprays.
• Powdery mildew: Can appear in crowded, humid spots – better spacing and airflow keep it down.