Greeting Terrarians!
Today I Will Show You How To Kill PLANTERA! :DDDDDD ( this is my first guide so sowwy it its bad.. ;-; ) so yeah!

First, Things You Need Are :
Honey,
Campfire ,
Heart lantern,
Full Turtle armor ( but read more of my guide if you dont want to !GRIND FOR AGES! ),
Star veil,
A lot of defensive/offensive accesories for Ranged,
With Ichor and a lot of buffs,
Buffs are Wrath Rage Tipsy And the Ichor buff,
Done

You could get Regen and lifeforce too.

Also You could sacrifice defense for hallowed armor invincibility! but that can be risky..

Step 1: Get (atleast) Full Titanium Or Adamantight Armour But If You Have The "Stinky DooDoo red garbage", then you should get a full set of Cholophite Armour And You You Have Titanium You CAN go the extra Mile And Also Get Cholophite Armour,

Step 2: Find A Pink Bulb !DONT MINE IT! Cause That Summons the boss! You Want to Mine Out a atlease 250x250 box with platforms or if you have good wings ( Leaf Wings ) with rocket boots too,

Step 3: Mine The pink Bulb Buff Up And Good luck!

Thank You For Reading My Guide This Far!!!! :D
i Hope EveryThing Helps! also i suggest playing with a friend too.