Polygala myrtifolia

Growing in Pots, Balconies & Indoors

Sweet-pea shrub (Polygala myrtifolia) is a fast-growing evergreen shrub (1.8-4 m) with near year-round purple pea flowers. The grower says it is not a houseplant but can be grown in a container – a good large-pot patio shrub in a mild climate, though it will want a roomy tub or eventually the ground.

Quick Details

• Container Size: A large pot for a big, fast shrub
• Indoor Suitability: Not a houseplant – an outdoor shrub
• Best Spot: Full sun to half shade, outdoors
• Soil & Drainage: Free-draining mix
• Watering in Pots: Small to average amount – drought-tolerant once established

Indoors & On the Windowsill

• Not a houseplant: The grower confirms it will not grow indoors; it is an outdoor flowering shrub.
• Windowsill: Too large and sun-hungry for a sill – grow it outside.

On a Balcony or Patio

• Light, wind & heat: Give it the brightest spot it will tolerate; walls and railings reflect heat and dry pots quickly, so check moisture often and shelter or stake exposed growth.
• Sun & wind: Give it a sunny spot; being tall and fast, prune to shape and stake against wind on exposed balconies.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A large pot with strong drainage holes for a vigorous shrub. Use strong drainage holes and skip a standing-water saucer to avoid root rot. Terracotta breathes and dries faster; glazed or plastic holds moisture longer.
• Potting mix: A free-draining, moderately rich mix.
• Feeding: Feed lightly in the growing season; it is not a heavy feeder.
• Repotting: Refresh the mix and pot up about every two years; for perennials, lightly root- and top-prune the plant when you do.

Bloom & Flower Guide

Quick Details

• Bloom Season: Nearly year-round in mild climates, mainly from late winter through summer
• Time to First Bloom: Usually within a year or two of planting
• Flower Appearance: Purple, pea-shaped flowers with a distinctive brush-tipped keel, carried in small clusters
• Edibility: Not eaten – grown as an ornamental flowering shrub

Detailed Blooming Overview

Sweet pea bush is prized for its remarkably long season of purple, pea-like flowers. In frost-free gardens it can bloom almost continuously, with the heaviest flush from late winter into summer.

Flower Characteristics

• Purple, pea-shaped flowers, each with a fringed, brush-like keel.
• Borne in small clusters over a long season.

Bloom Care & Thinning

• Prolonging bloom: A light trim after the main flush keeps the shrub neat and encourages fresh flowers.
• Conditions: Full sun and good drainage give the best flowering; drought tolerant once established.