Big Flowers are plants in Pikmin Bloom that can be found throughout the world at set points of interest. They appear on the map screen with circles around them with a radius of 40 meters. If a player is planting flowers within the Big Flower's radius, it will contribute towards blooming the Big Flower. After 300 flowers are planted in the radius, the flower will bloom and reward players who plant flowers nearby with an expedition to collect a fruit from it. (If a player has not yet unlocked the ability to do expeditions, they will not get a reward from a Big Flower.) The nectar provided by the fruit depends on the type of flowers that were planted in the radius.
A Big Flower has 3 stages:
Each time a Big Flower grows to its next stage, it will flash in light and change in appearance. In addition, when more than 150 flowers are planted in the radius, the bud will flash and falling petals will temporarily surround it.
When a Big Flower blooms, the type of flower it becomes depends on the flowers planted inside its radius. The color of the flower (and therefore the type of fruit it provides) depends on the color of the planted flowers, and the species of the flower (and therefore the species of nectar the fruit provides) depends on the species of the planted flowers.
A Big Flower's eventual bloomed color is determined by the color of the flowers that players plant within, with additional complexity added by white flowers. For red, blue, and yellow flowers, having a majority of that color of flower planted within the radius will cause the Big Flower to grow into that color. For a Big Flower to grow into a white flower, at least 70% of the flowers in the radius need to either white, or another color that is not the most prevalent non-white color, and when the 300 flower goal is reached, the color of the Big Flower will still be randomly picked.
The likely eventual color and type of a Big Flower is displayed in the screen that appears when an unbloomed Big Flower is tapped. The color displayed does not guarantee that it will be eventual color of the Big Flower, because it could still change as more flowers are planted. The colors "red", "blue", and "yellow" will display in this message if that color of flower is the most common non-white color within the radius, and if the 70% rule for white flowers has not been reached. The color "white" is never displayed here, as if the 70% rule has been reached, the color will be displayed as "???" instead. For example, if there are 40 white flowers and 30 red flowers within a Big Flower's radius, the Big Flower will say it will be red, because there are less than 70% white and non-red flowers. If an additional 20 yellow and 20 blue flowers were planted within, they would contribute to white as there are less common than red flowers, and the Big Flower would display "???" as its eventual color.
There are 2 main categories of flower types: basic flowers (from standard petals), and rare flowers (such as pansies, camellias, and roses). If only basic flowers are planted within the radius, the Big Flower will most likely be some color of basic flower, with a small chance of being a rare flower. If mostly rare flowers are planted within the radius, the Big Flower will most likely be the most common type of rare flower, though with some additional complexity and randomness. The chances of different flower species blooming has varied throughout the game's lifespan, and events have frequently added temporary boosts to certain probabilities.
This table describes how Big Flower species probabilities have changed over time.
A player can perform strategies to increase the odds of obtaining difficult-to-get nectar from Big Flowers. They can use any 2-3 red/blue/yellow pansies combined with white petals to bloom a white pansy or a third color pansy which they may not have with the random color selection of a white flower being chosen.
A player can use unwanted petals when purposefully blooming a scarce color like blue by planting over 100 blue flowers within an empty Big Flower and then filling the rest of the amount with less than the blue in red and yellow (e.g. 110 blue, 95 red, 95 yellow). Doing this correctly will bloom a blue Big Flower, and it is easier to perform with a larger amount than 110 Blue flowers planted.
It may be possible to do this strategy using normal, pansy, and rose flower types in order to only plant 110 roses within a Big Flower in order to make it bloom as a rose.
These are the sprites used for each type of Big Flower in the screen at the end of a flower planting session.