Last
spring we bought 2 rhododendrons: Horizon Monarch and Firelight. We
planted them one close to each other in Ericaceous compost. We added
a fertilizer in summer (super enriched Ericaceous Plant Food) and
again this April. They both had beautiful flowers last year (the
Firelight much more than Horizon) and in both the buds appeared in
summer.

After
winter the Horizon looked great and has already plenty of flowers.

The
Firelight looks rather poor, some of the leaves are partially brown
(withered), a bit yellowish, with tiny brown dotts. The buds are
small and have brown edges.

Someone
suggested to replant the Firelight to another place in the garden.
Can it help? Is it anything else we could do to help this great plant
to flourish?

Is
it potassium defficiency? Is tomato feed good for it?

Or
maybe fungus is a problem?

Some
photos underneath.

I
would be grateful for some suggestions.