My buxus plant has went yellow
By Marydoll
North lanarkshire, Scotland, very windy, wet and cold often,
United Kingdom 
not sure if too wet it is in a tub.! quite a lot of rain but it is also sunny.
19 May, 2009
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It could be a lack of food, the rain may of leached it from the soil especially if its in a pot. Try a weak liquid tomato food. They tend to suffer from the cold and trun a sickly green and should recover with TLC.
Possibility of box blight but the plants loose thier leaves and go tiggy.
Blighted plants need burning and secauteurs etc sterilising. The compost in the pot will need bining and pot sterilised. Unlikely it is but another option..
16 Jun, 2009