Producing The New New Guinea Impatiens This has long been a gardening favourite, as reflected by its strong retail sales year after year. BY MIKE FERNANDEZ A longtime garden favourite, New Guinea impatiens can be an easy growing option for the greenhouse producer as well, with a few simple tips and techniques. That is true of the newer sun loving varieties like Sun Harmony as well. This series provides all of the same features that have made New Guinea impatiens so pop-ular, with the added advantage and versatility of growing in partial shade and full sun alike. Sun Harmony varieties, for example, are well branched with a lovely mounded and compact habit. Plants are covered in large 5 cm flowers and excel in both the ground and containers. Rooting and transplant: For rooting, choose a light, well draining peat media. Keep pH at 6.0 to 6.5, and maintain electrical conductivity (EC) at MAIN Sun Harmony™ Baby Pink. BOTTOM Harmony™ Orange. 42 GREENHOUSE CANADA -October 2017 approximately 0.6 to 0.8. Apply a preventive fungicide spray at sticking to protect from botrytis. Maintain greenhouse temperatures at 22 to 24 C (72 to 75 F). Keep soil moderately dry. No fertilizer in the mist is needed. Light levels should be high – 5000 foot-candles or more. Time to transplant should be approximately four weeks for well-rooted liners. Plant in January to March for a spring finish. From a 10 cm (4 to 6 inch) pot, plants will be ready for sale in eight to 10 weeks. Plant one plant per pot and three per pot with 25 cm (10 inch) pots or hanging baskets, and plants will be ready for spring sale in eight to 10 weeks.