BRUNERA 'jack frost' macrophylla affected by oak tree?
We have had some beautiful 'jack frost' macrophylla [your website would not let me enter the common name - BRUNERA - unless I capitalized it] under a very tall oak tree for about 5 years. This last winter didn't help, but it now seems that they have lost their vibrancy - plants not bushing out, small leaves, didn't flower well. Could this be due to some chemical that the oak has put into the soil? I know oak leaves are not good to let accumulate, but we keep the base of the tree totally free of leaves. We have kept branches cut so that the light environment pretty much has stayed the same. Also, have felt like the watering schedule has stayed the same. Any ideas?