Answer: Dracaena is a frost tender plant and in most areas of the country it is used as a houseplant. In southern California, it grows outdoors without problem so you won't need to bring it indoors, unless frost is predicted. If you have had the plant for 4 years and it has been healthy up to now, I'd look for pests, for changes in watering or feeding practices, or changes in its exposure to sunshine or reflected heat.
Dracaena generally loses its lower leaves as the plant grows, so what you describe may be a natural process. If the newer leaves are the ones that are turning yellow, it could indicate over- or under-watering, or under-feeding. Your plants might also be telling you that the water you're using has too much salt in it. Try watering with distilled water, and watering only when the top of the soil has dried out. Then water thoroughly, ocassionally immersing the pot in a larger container of water until no more bubbles rise to the surface. This will drive out any air pockets around the roots. Feed your Dracaena during the growing season with a half-strength dilution of liquid fertilizer. The above suggestions should help your plants regain their health. Best wishes with your Dracaena.
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