Posted: 05/11/2012 at 15:39
Are you watering them? Remember that the plants can act like an umbrella preventing water reaching the soil, so rain alone is rarely enough. Box is normally fine in north facing aspects, so I also suspect that it may be exposed (windy), or the planter too small for the size of plants. Fushia standards are not a good choice for north facing aspects as they need sun.
If you reply about how windy and exposed the site is and pot size then we might have better ideas for you.