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Alcantarea imperialis Rubra are a tough, exotic-looking Bromeliad with a large rosette shape, eventually growing to be 1.5 metres wide and up to 1.5 metres tall. They have broad grey leaves with a maroon underside, with the colour going a much deeper red in colder (frost-free) climates. After around 10-20 years they will produce a large red flower spike, with small, fragrant yellow flowers on each bract; this spike can grow up to 3 metres tall. Rubra are well suited to most conditions and are commonly used indoors, under cover on balconies/patios and even in the garden in full sun. It's important to keep the 'central vase' topped up with water; however, if left for too long the water can stagnate, so it's a good idea to empty and replace the water each month or so.