english box is dying - please help

[zamora.com]

we have 2 english boxes with leaves going from copper to yellow - i think
they're dying?!

they are quite expensive and a slow grower and so far they have grown to
about 1 foot each. I have 5 of the same species and only 2 are turning
yellow eventhough it's in the same location.

they're in plastic pots, and I've repotted all of them with new potting mix
and stuff a couple of weeks ago - the other 3 are good and healthy, but the
2 are going yellow - what's going on??? Should I use some special
fertiliser, I'm currently using a slow release one. Is this a good time to
prune the yellow dying leaves, or is spring/summer better?

Please help.

Thanks in advance,
Rom

[nmcloughlin]

This article may help{from about.com)
Buxus sempervirens - Box
Family - Buxaceae
Description
Evergreen small tree, slow growing and long lived.
Height max 9m.
Habitat
Prefers chalk and limestone slopes sometimes with Beech.
Natural Distribution
Native to a few locations in Southern England and distributed though
Southern Europe, N.Africa and Western Asia.
The Tree Year Flowers Leaves Fruit Ripen Fall
Apr-May Sept-Oct
Propagation and growth
Seed cases open suddenly ejecting small black
seeds up to 3m away. Grown from seeds or cuttings.
Timber
Yellow very hard and dense wood.
Uses of Wood
Has been used for carving, turnery, engraving blocks and inlay work. Takes a
high polish and once highly valued. Still used for heads of mallets and
rulers
Food and Drink
Considered to have medicinal properties.
Related Species
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[Susan Young]

Box can look yellow for several reasons:
Vine weevil eating the roots -when you repotted them did you check the roots
for vineweevil?
Too wet, too dry or too windy
There is also a fungus which can decimate box, but you might expect them all
to suffer.
Cold can also affect them asthey are not always completely hardy, the new
growth especially can be affected by frost.
You have done what you can - I would cross fingers and hope new growth
appears.
Sue Y
www.computergardening.co.uk

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[Tim Longville]

Sounds to me as though this may well be the fungus Sue Y mentioned,
which I seem to remember was originally imported on plants - from
Holland? - and has now attacked many box hedges throughout the
country, including those at many NT and NTS gardens. I was talking
about it to the gardener at Geilston in Scotland and he said that
they'd been using a spray with quite good results - you clip out all
the infected wood, then spray, and spray and re-spray ad infinitum,
every time it shows signs fo returning. Painful and
time-and-money-consuming but better than destroying the plants -
certainly if you've got thousands of'em in hundreds of yards of hedge,
as they have at Geilston. I think the spray they used came from either
MAFF or HDRA but there may well by now be a 'garden centre' version.
I'm sure if you got in touch with your regional NT office and
explained your problem, they'd be able to connect you with someone
who'd know how you could get hold of the stuff.
Tim Longville

[Carla]

Sometimes temperature changes cause yellowing and leaf drop. Sometimes it's
a mineral deficiency. If you use fertilizer, make sure it has trace
elements/minerals in the formula as well.

Carla

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