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.
We often see them growing naturally under trees, combined with azaleas, impatiens and other moisture-loving plants. But while most ferns need shade and high humidity to survive our long summers, there are two common ferns that grow well in full sun and dryish soil. One is Thelypteris kunthii (Southern Shield Fern).