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Dragon tree (Dracaena marginata) is a low-maintenance houseplant that has few problems. The "Tricolor" cultivar, commonly called rainbow plant or rainbow tree, has cream and yellow stripes on narrow green leaves.
Temperature & Light:
With good light, dragon trees can grow up to 18 inches per year for the first few years and may reach a height of 10 to 15 feet. Dragon trees need moderate to bright indirect sunlight. Brown spots on the leaves usually indicate the plant is getting too much light. If the plant doesn't get enough light the leaves turn pale. Dragon trees like comfortable room temperatures of between 65° and 75° F.
Watering: A sure way to kill a dragon tree is to over-water it. Water the plant only when the top 1 inch of soil is dry and then water it thoroughly with room-temperature water. Never allow the base of the pot to sit in a saucer of water. Feed the plant with a liquid houseplant fertilizer every two weeks in spring and summer, and monthly in fall and winter.
Care Tips: Rainbow plants are usually purchased as tabletop plants, but they grow quickly to become floor plants. With good care, they can grow to a size that the average home can't accommodate. When the plant threatens to outgrow its space you can control the height by cutting off the top to the desired height. The tall, bare cane looks odd for a while, but within a few weeks, two new shoots appear and the foliage begins to regrow.