Answer: The foliage growth is what sustains and rebuilds them, so you need to encourage those leaves to be as healthy (and numerous) as possible. They respond beautifully to both a longer growing season and to being planted in the garden each summer, especially in areas with longer growing seasons. I suspect the reason for this is the improved light and more complete range of nutrients available in good garden soil. You might try using fertilizer that contains minor nutrients, an occasional top-dressing of compost, and possibly experiment with a seaweed-based fertilizer. If at all possible, you might also try extending or enhancing the light they receive by either planting them outdoors in the summer or using some supplemental lights. Finally, make sure that they are in pots large enough to sustain their increased size, as well as in soil that is refreshed regularly.
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