The sections of the light spectrum which the âredâ and âgreenâ cones perceive overlap and this is why red and green colour vision deficiencies are often known as red/green colour blindness and why people with red and green deficiencies see the world in a similar way.
Boston Fern The most common indoor fern, Boston ferns are long-lived plants that can reach more than 5 feet tall and wide at maturity (though indoors they rarely reach that size). Fern breeders have released a large number of varieties -- from selections with golden fronds to fantastically frilled fronds.
More than 20,000 known species of ferns grow around the world. Many types of ferns flourish both outdoors and as houseplants. Outdoor ferns thrive best in partially shaded areas and those grown indoors flourish in bright light, provided they are not placed in the path of direct sunlight.