Why Michelia ALBA on the ground dosen't grow
My M. ALBA has been in the ground almost 3 years. It JUST grows a little bit bigger compared with that when I put it into the ground three years ago. Now it is some 6' tall under the full sun.
I planted it with Mirocle/Gro potting soil.
Fertilize it regularly, once a wk with Miracle/Gro and Fish emulsion.
Water it regularly.
In first two summers, I gave it a filtered sun by installing a frame with black filter over it to get rid of strong Sol CA sun. However, this summer, I let it go with full sun ( I thought that the reason it don't grow may be due to lack of full sun). Now the tree leaves become yellowish and brown in the tip (or half of the leaves become brown.)
I doubt if the potting soil for the ground tree is right choice?
Anyone out there has the experience with this situation?
If I need to replace the soil and how and when can I do it?
Any advises would be very much appreciated.
Thanks in advance!