San Francisco Orchid Society
Phalaenopsis Care
in San Francisco
SF-specific care advice for the world's most popular orchid — from a society that has been growing them here since 1950.
Good News: SF Is Perfect for Phals
Phalaenopsis orchids (moth orchids) are native to Southeast Asian rainforests — environments with warm days, cool nights, high humidity, and filtered light. San Francisco provides all of these conditions naturally. The city's marine climate means you don't need a humidifier, a heat mat, or any special equipment to grow beautiful Phals on a windowsill.
The most common mistakes SF growers make are overwatering (the cool climate means plants dry out slowly) and placing plants in north-facing windows without supplemental light. Both are easily fixed.
SF-Specific Care Guide
Light
East-facing window = ideal. North-facing = acceptable with grow light supplement. South or west = add sheer curtain. Leaves should be medium green — yellowing means too much light, dark green means too little.
Watering
Water once per week in summer, every 10–14 days in winter. Pour water through the pot until it drains freely, then let dry before watering again. Never let the pot sit in standing water.
Temperature
Phals prefer 65–80°F during the day and 55–65°F at night. SF's natural temperature differential — warm days, cool nights — is perfect for triggering rebloom. No heating or cooling equipment needed.
Reblooming
After blooms drop, cut the spike just above the second node from the base. In SF's cool fall, the temperature drop naturally triggers a new spike. Most Phals rebloom reliably here without any special treatment.
Common Problems & SF-Specific Solutions
Yellow leaves
Usually overwatering in SF's cool climate. Stretch watering interval by 3–4 days.
No rebloom after 12+ months
Move to a cooler spot (near a window) in September–October to trigger spike initiation.
Root rot
Common in north-facing apartments where pots stay wet. Switch to bark mix and terracotta pots for faster drying.
Limp leaves
Either underwatering or root damage. Check roots — healthy roots are firm and green/silver.
Ready for More Than Phals?
Once you've mastered Phalaenopsis, SFOS can introduce you to hundreds of other genera that thrive in SF's climate. Join us at a monthly meeting to see what's possible.