The Sun's Effect on Blue Hostas Blue hostas require the most protection from the sun because the blue color is actually a waxy coating on the top and or bottom side of the leaves. The leaves are actually a shade of green, but the waxy coating makes them appear those great shades of blue. Too much sun can cause the waxy coating on blue hosta leaves to melt off and expose the green leaf underneath. This is the reason it is recommended that blue hostas are planted in more shade than other hostas. The blue hostas are always very popular and there are several shades of blue-leaved hostas. Blue hosta leaves will become bluer and bluer each year as they move to maturity, usually about four to five years.
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