Hey 
Thanks for the reply, I appreciate it.
But I don’t think that’s the case.
And I am playing this Deck for years in real life even on official tournaments.
The Cards explicitly say that if I drew a Flower Cardian I can show it and special summon it. Otherwise the Card would just say “add it to your hand” (as other cards of the achetype do) because exept Flower Cardian Pine I would be able to special summon them regardless due to fullfilling their own effects.
But Other than those cards that just add the flower cardian to my hand (like Cherry Blossom with Curtain), who are quite easy to bring out, the 4 mentioned ones need way more specific setup, the specific card they are based on to be exactly to get out and therefore have the higher payoff of letting me special summon the card I drew, and I think that that is what they intended to do because the whole archetype is about summoning ansd gathering the cardians on the field.