We live in Victoria. In spring we planted a row of ceanothus "Victoria" (5 feet tall) across our back fence (good sun exposure) in a raised bed. They grew like crazy over the summer...at least another 12 to 18 inches in height. About 6 weeks ago we covered the planting bed in cedar bark mulch to keep down weeds, leaving uncovered a circle of about 8" radius around the trunks. In the last couple of weeks (since fall set in) some of the leaves are yellowing (particularly on new growth)...worse on some plants than others. Is this normal for ceanothus at this time of year or am I killing the plants with the mulch by not allowing enough air/drainage? Thank you!