Hi, I have a 12' Magnolia Grandiflora Edith Bogue that was planted 4 yrs ago, and has done very well up until this spring. All throughout this spring and summer the new leaves have been deformed, and only 1 or 2 blooms appeared this year. These blooms died very quickly. The new leaves came out with holes and slightly twisted. The tree has clearly been in distress this year. I've used an all-purpose 6-8-6 slow release fertilizer on it this spring and also again in late August. I'm pretty sure the roots haven't suffered drought this spring & summer. Also discovered this spring was a 2 1/2" split in the bark just above ground level. Does anyone know what these problems could be from? We didn't have a particularly harsh winter last year here in Langley, and I haven't winterized it with mulch before. Any advice is appreciated, thanks!