Possibly the mother of all stretches but the pods in Ridley Scott's Alien [1979] might count as an alien plant life stage. The pods themselves aren't eggs as nothing develops in them. It's more like a seed with a mobile kernel.
Like I said - a stretch - but it is alien life we're talking about.
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"...they say you die twice. One time when you stop breathing and a second time, a bit later on, when somebody says your name for the last time." - Bansky
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