Vandas love the heat and high light. Cooler weather really slows them down. Summer I water every day and fert. once a week. In winter water/fert once every 5 days or so. I alternate between 20-14-13 w/a couple drops of superthrive and 11-35-15 (bloom booster) w/a couple dros of superthrive. My Princess Mikasa is in bloom right now with 2 spikes......she's a beauty! Good luck with yours.