Triggering Spikes on Phalaenopsis & Dendrobium: Light, Media & Rest Periods

Theo's Phalaenopsis (2 years no bloom, new offshoot/keiki, moss medium) and Dendrobium (3 canes, 1 new 4-inch growth with roots, west window) needed flowering triggers.

Phalaenopsis: Light Is #1 Factor

• Light must cast distinct shadow on leaf (finger test).
• Light green leaves = sufficient for bloom; dark green = too low.
• Moss medium compacts → root rot → weak plant. Repot in soaked fir-bark mix.
• New keiki (2") grows slowly—focus on mother plant vigor.

Dendrobium: Growth → Rest → Bloom Sequence

• Active growth: heavy feed/water, lots of light.
• When growth matures (cane hardens): stop feed, then stop water (mist 2×/week).
• Rest period = months. Cool nights, bright light.
• Old leafless canes = nutrient reservoirs—don't cut unless collapsed (rot).
• Warm vs cool growers: most are warm; cool types bud on canes, not spikes.

Follow-Up: Theo's Adjustments

Phalaenopsis: leaves yellowed from too much light → moved to south window with tree shade. Moss 3 years old → must change to bark. Deep roots firm, surface roots brown/soft.

Dendrobium: growing well west window, new cane >½ old cane size, tiny basal growth on new cane. Expert: sequence = growth → rest → bloom. Feed heavily now. Force rest from September (withhold water). Likely blooms fall again.

Second Follow-Up: Rest Period Clarification

Most common: growth → rest → bloom. Some bloom on old canes, some on new. Expert's Dendrobium bloomed on last year's cane after fall rest. Don't shorten rest—risks new vegetative cycle instead of flowers. Let plant guide timing.