Answer: Tip burn can be a result of water stress, fertilizer burn or low humidity (dry air). Or, it could be the very beginning of a fungal disease. Inspect a few of the affected leaves using a magnifying glass. Look for brown or black specks (fungal spores). If you find none, the problem is cultural. pH can affect a dogwood's growth and its ability to use the nutrients in the soil. Most dogwoods like slightly acidic soils. pH won't cause tip burn, though. Good luck with your dogwood.
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