Answer: It sounds as though you're doing everything right to keep your orange jasmine healthy. It's true, you'll need to move it indoors when the weather begins to change; the best way to avoid too much stress to your plant is to move it in gradually. I move mine indoors before I turn on the indoor heat so that the temperatures indoors and out are similar. Start by moving it inside at dusk and keeping it in until morning. Each day keep it inside for longer and longer periods. In a week to 10 days it should be spending 24 hours indoors. It will grow best inside in a brightly lit spot (no direct sunshine), in average household temperatures. Continue your watering and feeding regime until it slows or stops its new growth (about January). At that time water regularly but don't feed. If it continues to bloom and grow, continue feeding, but usually growth stops in mid-winter and doesn't begin again until spring.
As for the white powdery residue, your plant may have powdery mildew which is a fungal disease. This can happen when days are warm, nights are cool and air circulation is poor. You can prune away the affected leaves and stems (prune stems back to a few leaves after they have developed 6-7 leaves). Pruning will open the plant up to better air circulation and will remove the fungal spores to keep the disease from spreading.
Your plant is a wonderful addition to any collection so enjoy!
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