Tips of only mature leaves dieing

Plants green and growing great. But the tips of the mature leaves are turning brown? Will post a pic later. Its in high quality potting mix mixed with local soil. Its outside in a shady spot in the ground not in a pot. Been feeding it seasol's power feed to help it get over transplanting. Soil ph is fine. Soil is damp. Rest of the leaves are perfect. Has a systemic pesticide and fungicide which have never given me probs before. Soooo I over nuted?
 
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