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.
North American native ferns like Sword Fern (Polystichum munitum) and Deer Fern (Blechnum spicant) are fantastic evergreen options for mixed height, texture and beautiful year-round interest. The trick: prune them at just the right time, and it takes no time at all! Many gardeners claim to dislike ferns because they âlook messyâ or are âhard to pruneâ. The reality is many evergreen ferns have fronds (theyâre not called leaves on ferns) that last only a year or so. Then those older fronds die back and turn brown, but they remain woven among the newer growth.