So I killed all mechanical bosses but the plantera has not spawned

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What bosses do you need to defeat before Plantera?

i just got into hardmode on my calamity playthrough and was mining some mythril and i found a plantera bulb even though i havent killed any mechanical bosses yet? : r/Terraria

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I can't find plantera's bulbs, why? (I killed mechanical bosses) : r/Terraria

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