This will help by keeping the direct sun off the dirt just above the still - small root ball. (fieryfoodscentral.com)
I create a faux root ball to give our 7.5 ′ tree another foot of height. -RCB- (diyshowoff.com)
Don't disturb the roots, but simply transplant the vermiculite root ball into a larger container that has commercial potting soil. (fieryfoodscentral.com)