Brassia/Brassidium Not Blooming in Edmonton: Light and Temperature Fixes

8-Year-Old Plant, 5 Pseudobulbs, Zero Flowers

Brassidium (Brassia × Oncidium) in sphagnum moss (replaced yearly), south window, Edmonton (far north), weekly weak fertilizer (3-12-6 or 7-8-6). Healthy growth, no spikes.

Problem: Insufficient Light Intensity & Seasonal Shift

• South window loses light as sun shifts north (spring–fall).
• Brassia/Oncidium alliance needs high light to flower.

Solutions

1. Move to west window (stronger afternoon light) or east window (morning sun).
2. Summer outdoors: After frost danger passes, place in partial shade (morning/afternoon sun, 50% midday shade).
3. Cooler nights outdoors often trigger spike initiation.

Fertilizer Note

High-phosphorus (3-12-6) is correct for bloom boosting. Continue weakly weekly.

Moss Caution

Yearly replacement is good—moss breaks down fast. Ensure excellent drainage.

Northern growers: summer outdoors is often the flowering key for Brassia-types.