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.
There may be up to 12,000 types of ferns. Ferns are known as vascular plants. They do not have seeds or flowers as they reproduce via spores. Ferns are generally known in horticulture as landscape plants. They are also used as houseplants and cut foliage. Cut ferns are especially useful in floral arrangements.