New Guinea touch-me-not, Impatiens (New Guinea type), Hawker’s impatiens, SunPatiens (hybrid group)
Impatiens hawkeri, commonly called New Guinea impatiens, is a warm-loving perennial from the rainforests of New Guinea, widely grown as a bedding and container plant in temperate regions. It forms a bushy, mound-like habit with fleshy stems and glossy, lanceolate leaves that may be deep green, bronze, or variegated. Large, five-petaled flowers in vivid shades of red, pink, orange, lavender, and white are produced continuously under good light, and the plants are largely self-cleaning. Compared with I. walleriana, New Guinea types have bigger flowers, thicker foliage, and better heat and sun tolerance when kept evenly moist. They prefer well-drained, organic-rich media and consistent moisture without waterlogging. In frost-free climates they are perennial; elsewhere they are treated as annuals or overwintered indoors. They are generally pest-resistant with good cultural care but may attract thrips or spider mites in dry, warm conditions.
Keep the medium evenly moist but not soggy. Water thoroughly when the top 1–2 cm (½–¾ in) of mix feels dry, then let excess drain completely. Avoid prolonged wilting—repeated drought causes leaf drop and fewer blooms—yet do not allow the root zone to remain saturated. Bottom-watering can help keep foliage dry. Use room‑temperature water and reduce frequency slightly in winter or low light, allowing a bit more surface dry-down between waterings.
Provide bright, indirect light indoors with a few hours of gentle morning sun. Outdoors, grow in partial shade to dappled light; many modern cultivars tolerate more sun if soil moisture is consistent. Avoid harsh midday sun, which can scorch leaves, especially in hot climates. Too little light leads to lanky growth and sparse flowering. Rotate containers weekly for even growth and maintain good light to sustain continuous blooms.
Feed regularly during active growth. Use a balanced, complete fertilizer at half strength every 2–3 weeks, or apply a slow‑release formulation labeled for flowering annuals. Aim for slightly acidic media (pH ~5.8–6.2) and supply calcium and magnesium (a cal‑mag formula helps) to prevent leaf issues. Avoid heavy ammoniacal nitrogen that can cause soft, leggy growth, and flush the potting mix periodically to prevent salt buildup. Reduce feeding in low light or during winter.
Ideal temperatures are 18–27°C (65–80°F). Protect from chills below 10–13°C (50–55°F) and absolutely from frost. Brief heat to 32°C (90°F) is tolerable with shade and ample moisture, but sustained high heat plus low humidity stresses plants. Avoid cold drafts and sudden temperature swings. Indoors, keep them away from heat vents and AC blasts; outdoors, bring plants in before nights consistently drop below 12–13°C (54–55°F).
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