I bought a young Apache Blackberry plant in a 4'' container. I transferred it to a gallon glazed clay pot. I use wood chip mulch. It has been around 2 months and the leaves are getting much bigger, but there has been hardly any vertical growth. It is 6'' tall now. It sits outside (zone 10) and gets 10 hours of sunlight.
I noticed that dark purple spots are showing up on half of the leaves. I see no insect pests. Is this discoloration a cause for my Apache Blackberry's slow growth?