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.
Shorter, Evergreen Varieties. Certain types of evergreen ferns are shorter than typical ferns and grow 6 to 8 inches tall by 8 to 12 inches wide. âKayeâs Laceratedâ has atypically wide fronds with crimped edges that resemble kale. It requires excellent drainage, prefers alkaline soil and does best when mulched.