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Orchid Flower Position by Genus: Top vs. Base Blooming

Common Genera Flower Origins

Top of pseudobulb: Cattleya alliance.
Base of pseudobulb: Most Oncidium alliance, Encyclia (mixed).
Along cane: Cool-growing Dendrobiums.
Top of cane: Warm-growing Dendrobiums.
Leaf axil: Brassavola (usually), rarely base.

Exceptions exist—plants can break patterns.

Orchids: Potting a Phalaenopsis Keiki Without Roots: Humidity Chamber Method; Phalaenopsis Keiki and Flower Spike Behavior: Light Response; Phalaenopsis Won't Bloom: Repotting, Light, Fertilizer & Temperature Triggers; Managing Multiple Phalaenopsis Spikes: When to Cut the Old Spike; Wild Orchid Identification: Need Column & Leaf Close-Ups; Encouraging Branching on Phalaenopsis Orchid Spikes; Identifying and Caring for Your First Phalaenopsis: Black Stem Diagnosis; New Phalaenopsis Owner Guide: Post-Bloom Care and Repotting in New Zealand; Post-Bloom Care for a Phalaenopsis Orchid; Walking Iris (Neomarica gracilis): The Apostle Plant That Propagates from Leaf Tips

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