last week we got a round of lows should kick cymbs into spiking. they do need a dip in temps especially at night with warmer days to spike. it was a bit colder in the valley, and they were foolproof out there. here my lows don't always get low enough for spikes. but usually. especially the common minature types. the standards are amazing when in bloom, and if you can learn their secret, very worth growing. it's the sort of thing people here will devote a portion of their back yard too. people build bleacher type benches and grow tons of them. i would avoid frost on a younger plant, but with 4 spikes, i'll admit you have a nice sized plant already, but don't push the freezing. a few days around 60-70 with nights under 40-50 (so a 20-25 degree day/night dip) for a good week or 3 is all it takes. any south facing window in a frostfree but unheated (that cold drafty room) will do. light is really important though, they need a south window, especially when growing. another secret - don't move them around a lot especially when spiking. don't repot unless you really need to. for these i would highly recommend some sort of non-rotting mix, but they do ok in the basic large bark mixes. and you can easily find the summer and winter fertilizers that help keep them on a seasonal growth. bulbs put out their flower stem, then a new vegetative growth (or 2). i don't ever recall getting a second spike from the same bulb. it can be hard to tell what bulb a spike is coming from though. these have a definite seasonal growth pattern. after they settle in they always around the same time, unless you have odd weather. that can throw them off. i have heard stories of people moving away from here and putting cymbidiums into a refrigerator at night for a few weeks. i did that forcing bulbs a few times, and theoretically it might actually work. but you need a really cold spare frig.