Today 
The classic window box plant, the pelargonium, is used here as a focal point for a sea of lightly scented, delicate-pink nemesia.
Plant it:
April - June
At its best:
June - September
Takes just:
20 minutes
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Place a layer of broken terracotta pot crocks in the bottom of the window box. Three-quarters fill the window box with compost.
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Make the pelargonium the focal point by placing it centrally. Surround it with nemesia but make sure they have room to spread over the summer.
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Position the box on a sunny windowsill, bearing in mind the nemesia will reach 30cm tall once established. Be ready to cover it if frost is forecast overnight.
"Remove the old blooms as soon as they fade and both plants will flower months."
"Try Nemesia 'Blue Confetti' if you want to vary the colour theme."
