Red flowers is an item obtained within the minigame Trouble Brewing. Red flowers and blue flowers are found in the minigame for both the red and blue teams to collect. Team members must collect these coloured flowers in order to make coloured water, which is then used as an ingredient in the rum. These flowers cannot be taken out of the minigame, but are tradeable within the minigame with a trade value of 100 coins.
For an exhaustive list of all known sources for this item, see here
This information has been compiled as part of the update history project. Some updates may not be included—see here for how to help out!