Balsam (Impatiens balsamina) Growing Guide: Tropical Impatiens for Sun and Shade

Balsam (Impatiens balsamina) is a tropical annual impatiens that thrives in full sun—unlike common shade-loving impatiens. Native to Southeast Asia, it grows 20–70 cm tall with soft, fleshy stems, spirally arranged pointed leaves, and showy trumpet-shaped flowers in pink, red, white, and purple from summer to fall. Ripe seed pods explode when touched, earning the name “touch-me-not.” The species I. balsamina has traditional uses: leaf juice for snakebites, crushed flowers for burns. Easy to grow from seed, it self-sows readily.

Growing from Seed

• Easy germination. Sow directly after last frost, or start indoors 6 weeks earlier.
• Ideal temp: 70°F. Surface-sow (light aids germination); keep moist. Germinates in 1–2 weeks.
• Transplant when 2″ tall, after soil warms. Space in groups of 5–6.

Site and Soil

• Light: Full to partial sun. In hot summers, provide afternoon shade. Too much sun → leaf scorch; too much shade → leggy, few flowers.
• Soil: Well-drained, moist but not soggy; pH 6.1–7.5.
• Amend with compost before planting; time-release fertilizer optional.

Water and Feed

• Water 3×/week in dry weather; pots need more frequent watering.
• Keep soil moist for continuous bloom. Water at base (soaker hose/drip line ideal) to avoid powdery mildew.
• Morning watering lets foliage dry by evening.
• Mulch to retain moisture.
• Feed 2×/month during growing season with general-purpose fertilizer.

Pests and Diseases

• Spider mites: Yellow mottled leaves, webbing. Use miticides for heavy infestations; remove weeds/affected plants; introduce ladybug larvae.
• Whiteflies: Sticky traps, pesticides, or strong water spray every few days.
• Aphids: Organic or inorganic pesticides.

Pruning and Maintenance

• Pinch tips above leaf joints to encourage bushiness.
• Bring indoors in cold weather.
• Remove seed pods regularly to control self-sowing, or collect seeds for next year (dry thoroughly, store in plastic bags).
• Dwarf variety ‘Tom Thumb Mix’ reaches 10″; some cultivars have double/multicolored flowers.

Balsam brings tropical color to sunny spots with minimal fuss—just manage its enthusiastic self-seeding.