Pseuderanthemum atropurpureum

Growing in Pots, Balconies & Indoors

Grown for its rich purple foliage, this tender tropical shrub is not listed by the grower as a true houseplant, but its need for warmth and light means a bright, warm windowsill suits it well. It makes a colourful patio pot in summer that must come indoors before cold weather.

Quick Details

• Container Size: A medium pot suits it; pot on as it grows to 30-120 cm
• Indoor Suitability: Not rated a full houseplant, but grows on a warm, bright windowsill
• Best Spot: Full sun to part shade with warmth; the best leaf colour comes in good light
• Soil & Drainage: Free-draining, organic-rich mix
• Watering in Pots: Small to average; keep lightly moist and warm, never cold and wet

Indoors & On the Windowsill

• Warm, bright sill: The grower does not class it as a full houseplant, but as a tender tropical it grows on a warm, bright windowsill with good light for strong leaf colour; it dislikes cold rooms and draughts.
• Overwintering: Frost-tender, so in cold climates keep it potted and bring it into a warm, bright room for winter – a key reason to grow it in a pot.

On a Balcony or Patio

• Light & warmth: A warm, sheltered, bright balcony brings out its purple tones in summer; keep it out of cold wind and move it under cover before temperatures drop.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: Use a pot with strong drainage holes; skip a standing-water saucer (or empty it promptly) so the roots never sit wet and rot. Terracotta breathes and dries fast; glazed or plastic holds moisture longer.
• Potting mix: A free-draining yet organic-rich mix – a quality potting mix or peat/coir blended with perlite or vermiculite for aeration.
• Feeding: Potted plants exhaust their soil faster than those in the ground – feed through the growing season, since nutrients leach out with every watering.
• Repotting: Refresh the top of the mix and pot on every couple of years; for perennials, lightly prune the root ball and top growth when you do.

Bloom & Flower Guide

Quick Details

• Bloom Season: Spring through autumn (near year-round in warm climates)
• Flower Appearance: Small white, pink or purple cross-shaped flowers on upright spikes above dark foliage
• Edibility: Ornamental only

Detailed Blooming Overview

Grown mainly for its deep purple foliage, Pseuderanthemum atropurpureum also produces dainty cross-shaped flowers over a long warm-season period that draw in pollinators.

Flower Characteristics

• Small five-lobed flowers, white to pink or purple, often with a spotted throat.
• Carried on slender upright spikes above the coloured leaves.

Bloom Care & Thinning

• Conditions: warmth, humidity and good light bring the best flowering.
• Shaping: pinch growing tips to keep the plant bushy and well-covered.