Dendrobiums from big-box stores are often evergreen types needing a dry rest after bloom. Your south window + sphagnum + constant water/feed is wrong for now.
Your 20-14-13 is high-N—good for growth phase. Switch to high-P (high middle number) when new canes mature. South window OK now; summer outdoors when >50°F nights.
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Rescuing Walmart Phalaenopsis: Yellow Leaves, Root Rot & Repotting Timing
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New Orchid Owner: Identifying Dendrobium vs. Phalaenopsis
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Saving a Rotting Phalaenopsis: Last-Chance Repotting and Patience
How to Separate and Pot Keikis (Baby Orchids) from Flower Spikes
Cymbidium Care: Post-Bloom and Outdoor Growing in the UK
Identifying a New Phalaenopsis Flower Spike vs. Root
Best Beginner Orchids for Indoor/Outdoor Growing in Southern Arkansas
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