Andy, I get at least two and sometimes even three flushes from my cycads (Zone 5). What I do is keep them in a BRIGHT, and REALLY hot spot and give it drowning watering every two days. But the most important thing is that I throw a hand full of cow manure onto them. The manure is almost a jump start as literally a couple days after applying, I get a new flush. BTW, this seems to work well with the Revoluta / Taitungensis Hybrid from Robert Chumley also. The manure seems to instantly push new flushes.

I germinated this Filifera two winters ago. Given ample space for the roots to grow they grow like weeds. My Sago is pushing up its 2nd flush (first was in April) Here is a link that might be useful:

What you had was an aborted flush of leaves. It is very common with cycas species. It is so common that I mention this happening in my water article. You say your plant gets adequate water. What exactly does that mean? If it was only getting watered a little twice a week or less, this could easily do what you are talking about. I water my cycas plants every day when they are flushing to keep this kind of thing from happening. Once they harden up, you can go back to the regular schedule.

Unless you have a greenhouse with ideal conditions, probably by next june/july (?) after a few months of good weather, water and nutrition. If you're keeping it indoors, don't try to force new growth with water and food because the weak indoor light will result in uncharacteristic leaves. Wait until the plant can be put outside in the sun next spring. Looks like your plant is still quite young. You may be able to get multiple flushes per year on a young plant. With older specimens, usually you get 1 annual flush with many leaves at a time. For example, I have a Cycas revoluta with about 10 inches of clear trunk and it sent out 26 leaves at once this spring. Unfortunately they are covered with speckled yellow dots as a result of a hail storm we had, but I'll get a new set of leaves next year so I'm not concerned. x