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The rare Alstroemeria isabellana from South America is quite different from the common Alstroemeria seen in floral arrangements. Its radiating sprays of tubular blooms have an eye-catching color combination of pinkish-orange and green. Each umbel can have 20 or more flowers - possibly the most of any Alstroemeria species. The plant is pretty in cultivation and not commonly seen for sale.
Alstroemeria isabellana is a perennial species from southern Brazil to Argentina. It grows during the summer, and can go dormant or partly dormant in winter. Its arching shoots grow about 2 feet long and are very attractive, looking somewhat like bamboo leaves. In summer, the flower stalks appear, which are about 18 inches tall. The vibrant blooms are almost 2 inches long, and open a few at a time, for a long flower show. Each plant can put up several flower stalks during the summer. They look surprisingly like the unrelated Phaedranassa. This is a true species, not a hybrid.
Despite coming from subtropical areas with mild temperatures, it has reportedly taken temperatures in the 90s (35°C). Still, consider it experimental in consistently hot conditions with warm nights. The underground rhizomes probably can survive down to 25 degrees F (-4°C) or less if planted deep. It grows well indoors in a pot, and may stay evergreen if grown inside. It enjoys rich, well-draining soil that's kept evenly moist. Mostly-sunny conditions are best, but some afternoon shade might be needed in warmer conditions.
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