The older the plant gets, the bigger it will develop its leaves. Older, smaller leaves are shed and replaced by new, larger ones. Of course, there is a limit to how big the leaves get, and leaf size varies by species/hybrid.
To get big leaves on a Phal, grow it well, and grow it to maturity. This really applies to any plant. By grow it "well", I mean fulfill all of the plant's cultural requirements. That, after all, is really the trick to growing any plant. Find out what it needs, and provide that. Sometimes this is easy to do, sometimes it's hard.
So there really isn't a trick to getting good strong growth on your Phals (or any plant) besides good, consistent culture, and a little patience. And like I say, there is variation in leaf size in Phals.
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