what is the effect of sodium chloride on the buddleia shrub?
Answers:
Too much sodium in the soil will cause buddleia to wilt and possibly even kill it, as it is rather drought tolerant. So if it is not being watered thoroughly, the salt will tend to build up.
When you DO water, water thoroughly. This will help to leach salts out of the soil and reduce the effects of salt build up. Rinse the foliage too, this helps to cleanse the leaves and prevent leaf scorch.
"Plant Care for Butterfly Bushes : Mulch butterfly bushes (Buddleia davidii) in the fall, then prune the plants back to the ground in late winter. This perennial will re-emerge from its roots in spring. Blooms tend to be larger and more prolific on butterfly bush's new growth, giving you incentive for pruning it. You essentially want to treat butterfly bush plant as if it were an herbaceous perennial rather than a shrub.
"Sun and Soil Requirements for Butterfly Bushes: Butterfly bush plants like full sun and a well-drained soil. Butterfly bushes are relatively drought-tolerant."
Also, you may consider replacing that shrub with a more salt tolerant one, assuming that the sodium is an ongoing situation... Where is most beautiful place of the world?