Samantha bought a young Phalaenopsis 2 months ago. Waters daily with diluted orchid food early morning, out of direct sun. Plant hearty, slight leaf growth. Recently one top leaf half brown. Rest healthy, growing. Rotates plant so sick leaf not constantly in sun, no improvement. Asks cause and fix.
Samantha, several causes possible. Focus: prevent spread and remove unsightly leaf. Cut leaf about 1 inch below brown area with sharp sterile razor/scissors. Grow in indirect light or morning sun only.
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