My point was that Genesis specifies God creating trees (and other plants) with seed already in them, not creating seeds, sowing then and waiting for them to mature before creating Adam and Eve and putting them in the Garden of Eden.
Joel 2:22 isn't talking about Creation, so of course it's not describing fully mature trees appearing out of nothing.
But it doesn't.
Genesis 1:11 NRSVUE
[11] Then God said, “Let the earth put forth vegetation: plants yielding seed and fruit trees of every kind on earth that bear fruit with the seed in it.” And it was so.
Let's think about the English language.
Let the Earth put forth vegetation, or sprout vegetation.
This first verse tells us that the earth will sprout it. But it doesn't say what kind of process is used to reach that state. Nor how long it will take.
Plants yielding seed. It tells us that these plants will yield seed, but it doesn't say When the seeds appeared, whether they were present initially when the plants sprouted or whether they developed later. Same with fruit trees. It tells us that the earth will sprout fruit trees. But there is no specification about the process or timing of that.
I could say "hey, I'm going to go plant a garden with trees bearing fruit!".
But that doesn't entail that I'm saying trees bearing fruit are just going to rip out of the ground with the fruit already formed.
In fact, the point that it says this vegetation will sprout from the earth, indicates that there is a process involved, with the timing unknown.
Regarding Joel, the point is about the Hebrew term and what it means. Green shoots, turning green, sprouting. Etc. these concepts do not indicate that the vegetation in question was fully mature at the onset. Only that it would eventually become so.
Here is another translation:
Genesis 1:11 NIV
[11] Then God said, “Let the land produce vegetation: (colon) seed-bearing plants and trees on the land that bear fruit with seed in it, according to their various kinds.” And it was so.
It merely says that the land will produce these things. No further details is given on the process or timing.
Genesis 1:12 NIV
[12] The land produced vegetation: plants bearing seed according to their kinds and trees bearing fruit with seed in it according to their kinds. And God saw that it was good.
Same here. The land sprouted or produced vegetation. But no clarity is given for a process or timing.
You could say, if the Genesis days were 24 hours long, then the fruit and seeds must have appeared within 24 hours. But that position would depend on someone viewing the 7 days of creation as an earth history textbook rather than something like a temple inauguration.